desert | National Geographic Society (2022)

Deserts are areas that receive very little precipitation. People often use the adjectives “hot,” “dry,” and “empty” to describe

deserts

, but these words do not tell the whole story. Although some

deserts

are very hot, with daytime temperatures as high as 54°C (130°F), other

deserts

have cold winters or are cold year-round. And most

deserts

, far from being empty and lifeless, are home to a variety of plants, animals, and other organisms. People have adapted to life in the

desert

for thousands of years.

One thing all

deserts

have in common is that they are arid, or dry. Most experts agree that a

desert

is an area of land that

receives

no more than 25 centimeters (10 inches) of

precipitation

a year. The amount of evaporation in a

desert

often greatly exceeds the annual rainfall. In all

deserts

, there is little water available for plants and other

organisms

.

Deserts

are found on every continent and cover about one-fifth of Earth’s land area. They are home to around 1 billion people—one-sixth of the Earth’s population.

Although the word “

desert

” may bring to mind a sea of shifting

sand

, dunes cover only about 10 percent of the world’s

deserts

. Some

deserts

are mountainous. Others are dry expanses of rock,

sand

, or salt flats.

Kinds of Deserts

The world’s

deserts

can be divided into five types—subtropical, coastal, rain shadow, interior, and polar.

Deserts

are divided into these types according to the causes of their dryness.

Subtropical Deserts
Subtropical

deserts

are caused by the circulation patterns of air masses. They are found along the Tropic of Cancer, between 15 and 30 degrees north of the Equator, or along the Tropic of Capricorn, between 15 and 30 degrees south of the

Equator

.

Hot, moist air rises into the atmosphere near the

Equator

. As the air rises, it cools and drops its moisture as heavy tropical rains. The resulting cooler, drier

air mass

moves away from the

Equator

. As it approaches the tropics, the air descends and warms up again. The descending air hinders the formation of clouds, so very little rain falls on the land below.

The world’s largest hot

desert

, the Sahara, is a

subtropical

desert

in northern Africa. The Sahara Desert is almost the size of the entire

continental

United States. Other

subtropical

deserts

include the Kalahari

Desert

in southern Africa and the Tanami

Desert

in northern Australia.

Coastal Deserts
Cold ocean currents contribute to the formation of

coastal

deserts

. Air blowing toward shore, chilled by contact with cold water, produces a layer of fog. This heavy

fog

drifts onto land. Although humidity is high, the atmospheric changes that normally cause rainfall are not present. A

coastal

desert

may be almost totally rainless, yet damp with

fog

.

The Atacama Desert, on the Pacific

shores

of Chile, is a

coastal

desert

. Some areas of the Atacama are often covered by

fog

. But the region can go decades without rainfall. In fact, the

Atacama

Desert

is the driest place on Earth. Some weather stations in the Atacama have never recorded a drop of rain.

Rain Shadow Deserts
Rain shadow

deserts

exist near the leeward slopes of some mountain ranges.

Leeward

slopes face away from prevailing winds.

When moisture-laden air hits a

mountain range

, it is forced to rise. The air then cools and forms

clouds

that drop moisture on the windward (wind-facing) slopes. When the air moves over the mountaintop and begins to descend the

leeward

slopes, there is little moisture left. The descending air warms up, making it difficult for

clouds

to form.

Death Valley, in the U.S. states of California and Nevada, is a

rain shadow

desert

.

Death Valley

, the lowest and driest place in North America, is in the

rain shadow

of the Sierra Nevada mountains.

Interior Deserts
Interior

deserts

, which are found in the heart of

continents

, exist because no moisture-laden

winds

reach them. By the time

air masses

from coastal areas reach the interior, they have lost all their moisture.

Interior

deserts

are sometimes called inland

deserts

.

The Gobi Desert, in China and Mongolia, lies hundreds of kilometers from the ocean.

Winds

that reach the Gobi have long since lost their moisture. The Gobi is also in the

rain shadow

of the Himalaya mountains to the south.

Polar Deserts
Parts of the Arctic and the Antarctic are classified as

deserts

. These

polar

deserts

contain great quantities of water, but most of it is locked in glaciers and ice sheets year-round. So, despite the presence of millions of liters of water, there is actually little available for plants and animals.

The largest

desert

in the world is also the coldest. Almost the entire

continent

of

Ant

arctica

is a

polar

desert

, experiencing little

precipitation

. Few

organisms

can withstand the freezing, dry climate of

Ant

arctica

.

Changing Deserts

The regions that are

deserts

today were not always so dry. Between 8000 and 3000 BCE, for example, the Sahara had a much milder, moister

climate

. Climatologists identify this period as the “Green Sahara.”

Archaeological evidence of past settlements is abundant in the middle of what are

arid

, unproductive areas of the Sahara today. This evidence includes rock paintings, graves, and tools. Fossils and artifacts show that lime and olive trees, oaks, and oleanders once bloomed in the Sahara. Elephants, gazelles, rhinos, giraffes, and people used stream-fed pools and lakes.

There were three or four other moist periods in the Sahara. Similar lush conditions existed as recently as 25,000 years ago. Between the moist periods came periods of dryness much like today’s.

The Sahara is not the only

desert

to have dramatic climate change. The Ghaggar River, in what is now India and Pakistan, was a major water source for Mohenjo-daro, an urban area of the ancient Indus Valley Civilization. Over time, the Ghaggar changed course and now only flows during the rainy monsoon season.

Mohenjo-daro

is now a part of the vast Thar and Cholistan

deserts

.

Most of Earth’s

deserts

will continue to undergo periods of

climate

change

.

Desert Characteristics

Humidity

—water vapor in the air—is near zero in most

deserts

. Light rains often e

vaporate

in the dry air, never reaching the ground. Rainstorms sometimes come as violent cloudbursts. A

cloudburst

may bring as much as 25 centimeters (10 inches) of rain in a single hour—the only rain the

desert

gets all year.

Desert

(Video) Deserts 101 | National Geographic

humidity

is usually so low that not enough water

vapor

exists to form

clouds

. The sun’s rays beat down through

cloudless

skies and bake the land. The ground heats the air so much that air rises in waves you can actually see. These shimmering waves confuse the eye, causing travelers to see distorted images called mirages.

Temperature

extremes are a

characteristic

of most

deserts

. In some

deserts

,

temperatures

rise so high that people are at risk of dehydration and even death. At night, these areas cool quickly because they lack the insulation provided by

humidity

and

clouds

.

Temperatures

can drop to 4°C (40°F) or lower.

In the Chihuahuan

Desert

, in the United States and Mexico,

temperatures

can vary by dozens of degrees in one day. Daytime

temperatures

in the Chihuahua can climb beyond 37°C (100°F), while nighttime

temperatures

can dip below freezing (0°C or 32°F).

Winds

at speeds of about 100 kilometers per hour (60 miles per hour) sweep through some

deserts

. With little vegetation to block it, the

wind

can carry

sand

and dust across entire

continents

and even oceans.

Windstorms

in the Sahara hurl so much material into the air that African

dust

sometimes crosses the Atlantic Ocean. Sunsets on the Atlantic coast of the U.S. state of Florida, for example, can be tinted yellow.

First-time visitors to

deserts

are often amazed by the unusual landscapes, which may include

dunes

, towering bare peaks, flat-topped rock formations, and smoothly polished canyons. These features differ from those of wetter regions, which are often gently rounded by regular rainfall and softened by

lush

vegetation

.

Water helps carve

desert

lands. During a sudden storm, water scours the dry, hard-baked land, gathering

sand

, rocks, and other loose material as it flows. As the muddy water roars downhill, it cuts deep channels, called arroyos or wadis. A thunderstorm can send a fast-moving torrent of water—a flash flood—down a dry

arroyo

. A

flash flood

like this can sweep away anything and anyone in its path. Many

desert

regions di

scourage

visitors from hiking or camping in

arroyos

for this reason.

Even

urban areas

in

deserts

can be vulnerable to

flash floods

. The city of Jeddah, Saudi Arabia, sits in the Arabian

Desert

. In 2011, Jeddah was struck by a sudden

thunderstorm

and

flash flood

. Roads and buildings were washed away, and more than 100 people died.

Even in a

desert

, water and

wind

eventually wear away softer rock. Sometimes, rock is carved into tablelike formations such as mesas and buttes. At the foot of these formations, water drops its burden of gravel,

sand

, and other sediment, forming deposits called alluvial fans.

Many

deserts

have no drainage to a

river

, lake, or ocean. Rainwater, including water from

flash floods

, collects in large depressions called basins. The shallow lakes that form in

basins

eventually e

vaporate

, leaving playas, or salt-surfaced lake beds.

Playas

, also called sinks, pans, or

salt flats

, can be hundreds of kilometers wide.

The Black Rock

Desert

in the U.S. state of Nevada, for instance, is all that remains of the prehistoric Lake Lahontan. The hard, flat surface of

desert

salt flats

are often ideal for car racing. In 1997, British pilot Andy Green set the land speed record in Black Rock

Desert

—1,228 kilometers per hour (763 miles per hour). Green’s vehicle, the ThrustSSC, was the first car to break the sound barrier.

Wind

is the primary sculptor of a

desert

’s hills of

sand

, called

dunes

.

Wind

builds

dunes

that rise as high as 180 meters (590 feet).

Dunes

migrate constantly with the

wind

. They usually shift a few meters a year, but a particularly violent

sandstorm

can move a

dune

20 meters (65 feet) in a single day.

Sandstorms

may bury everything in their path—rocks, fields, and even towns. One legend holds that the Persian Emperor Cambyses II sent an army of 50,000 men to the Siwa Oasis in western Egypt around 530 BCE. Halfway there, an enormous

sandstorm

swallowed the entire group. Archaeologists in the Sahara have been unsuccessfully looking for the “Lost Army of Cambyses” ever since.

Water in the Desert

Rain is usually the main source of water in a

desert

, but it falls very rarely. Many

desert

dwellers rely on groundwater, stored in aquifers below the surface.

Groundwater

comes from rain or other

precipitation

, like snow or hail. It seeps into the ground, where it can remain for thou

sands

of years.

Underground water sometimes rises to the surface, forming springs or seeps. A fertile green area called an

oasis

, or cienega, may exist near such a water source. About 90 major, inhabited oases dot the Sahara. These oases are supported by some of the world’s largest supplies of underground water. People, animals, and plants all surround these oases, which provide stable access to water, food, and shelter.

When

groundwater

doesn’t seep to the surface, people often drill into the ground to get to it. Many

desert

cities, from the American Southwest to the Middle East, rely heavily on such

aquifers

to fill their water needs. Rural Israeli communities called kibbutzim rely on

aquifers

to furnish water for crops and even fish farming in the dry Negev

Desert

.

Drilling into

aquifers

provides water for drinking, agriculture, industry, and hygiene. However, it comes at a cost to the environment.

Aquifers

take a long time to refill. If

desert

communities use

groundwater

faster than it is replenished, water shortages can occur. The Mojave

Desert

, in southern California and Nevada, for instance, is sinking due to aquifer depletion. The booming

desert

communities of Las Vegas, Nevada, and California’s “Inland Empire” are using water faster than the

aquifer

is being refilled. The water level in the

aquifer

has sunk as much as 30 meters (100 feet) since the 1950s, while the land above the

aquifer

has sunk as much as 10 centimeters (4 inches).

Rivers

sometimes provide water in a

desert

. The Colorado

River

, for instance, flows through three

deserts

in the American Southwest: the Great

Basin

, the Sonoran, and the Mojave. Seven states—Wyoming, Colorado, Utah, New Mexico, Nevada, Arizona, and California—rely on the

river

for some of their water supply.

People often modify

(Video) National Geographic Society (1976)(Extended Opening variant)

rivers

to help distribute and store water in a

desert

. The Nile

River

ecosystem dominates the eastern part of the

Sahara

Desert

, for instance. The Nile provides the most reliable, plentiful source of freshwater in the region. Between 1958 and 1971, the government of Egypt constructed a massive

dam

on the Upper Nile (the southern part of the

river

, near Egypt’s border with Sudan). The Aswan Dam harnesses the power of the Nile for hydroelectricity used in

in

dustry

. It also stores water in a manmade lake, Lake Nasser, to protect the country’s communities and

agriculture

against drought.

Construction of the Aswan High

Dam

was a huge engineering project. Local

desert

communities can divert

rivers

on a smaller scale. Throughout the

Middle East

, communities have dug artificial

wadis

, where freshwater can flow during rainy seasons. In countries like Yemen, artificial

wadis

can carry enough water for whitewater rafting trips during certain times of the year.

When

deserts

and water supplies cross state and national borders, people often fight over water rights. This has happened among the states in the Colorado

River

Basin

, which have negotiated for many years over the division of the

river

’s water. Rapidly expanding populations in California, Nevada, and Arizona have compounded the problem. Agreements that were made in the early 20th century failed to account for Native American

water rights

. Mexican access to the Colorado, which has its delta in the Mexican state of Baja California, was ignored.

Desert

agriculture

, including cotton production, demanded a large portion of the Colorado. The environmental impact of

dams

was not considered when the structures were built. States of the Colorado

River

Basin

continue to

negotiate

today to prepare for population growth, agricultural development, and the possibility of future

droughts

.

Life in the Desert

Plants and animals

adapt

to

desert

habitats in many ways.

Desert

plants grow far apart, allowing them to obtain as much water around them as possible. This spacing gives some

desert

regions a desolate appearance.

In some

deserts

, plants have unique leaves to capture sunlight for photosynthesis, the process plants use to make food. Small pores in the leaves, called stomata, take in carbon dioxide. When they open, they also release water

vapor

. In the

desert

, all these

stomata

would quickly dry out a plant. So

desert

plants typically have tiny, waxy leaves. Cactuses have no leaves at all. They produce food in their green stems.

Some

desert

plants, such as

cactuses

, have shallow, wide-spreading root systems. The plants soak up water quickly and store it in their cells. Saguaro

cactuses

, which live in the Sonoran

Desert

of Arizona and northern Mexico, expand like accordions to store water in the

cells

of their trunks and branches. A large saguaro is a living storage tower that can hold hundreds of liters of water.

Other

desert

plants have very deep roots. The roots of a mesquite tree, for example, can reach water more than 30 meters (100 feet) underground.

Mesquites

, saguaros, and many other

desert

plants also have thorns to protect them from grazing animals.

Many

desert

plants are

annuals

, which means they only live for one season. Their seeds may lie dormant for years during long dry spells. When rain finally comes, the seeds sprout rapidly. Plants grow, bloom, produce new seeds, and die, often in a short

span

of time. A soaking rain can change a

desert

into a wonderland of flowers almost overnight.

Animals that have

adapted

to a

desert

environment are called xerocoles.

Xerocoles

include species of insects, reptiles, birds, and mammals. Some

xerocoles

avoid the sun by resting in scarce shade. Many escape the heat in cool burrows they dig in the ground. The fennec fox, for example, is native to the

Sahara

Desert

. Fennec fox communities work together to dig large

burrows

, some as large as 93 square meters (1,000 square feet). Dew can collect in these

burrows

, providing the foxes with fresh water. However, fennec foxes have

adapted

so they do not have to drink water at all: Their kidneys retain enough water from the food they eat.

Most

xerocoles

are nocturnal. They sleep through the hot days and do their hunting and foraging at night.

Deserts

that seem

desolate

during the day are very active in the cool nighttime air. Foxes, coyotes, rats, and rabbits are all

nocturnal

desert

mammals. Snakes and lizards are familiar

desert

reptiles. Insects such as moths and flies are abundant in the

desert

. Most

desert

birds are restricted to areas near water, such as

river

banks. However, some birds, such as the roadrunner, have

adapted

to life in the

desert

. The roadrunner, native to the

deserts

of North America, obtains water from its food.

Some

xerocoles

have bodies that help them handle the heat. A

desert

tortoise’s thick shell insulates the animal and reduces water loss.

Sand

lizards, native to the

deserts

of Europe and Asia, are nicknamed “dancing lizards” because of the way they quickly lift one leg at a time off the hot

desert

sand

. A jackrabbit’s long ears contain blood vessels that release heat. Some

desert

vultures urinate on their own legs, cooling them by

e

vaporation

.

Many

desert

animals have developed ingenious ways of getting the water they need. The thorny devil, a lizard that lives in the Australian Outback, has a system of tiny grooves and channels on its body that lead to its mouth. The lizard catches rain and

dew

in these grooves and sucks them into its mouth by gulping.

Camels are very efficient water users. The animals do not store water in their humps, as people once believed. The humps store fat. Hydrogen molecules in the fat combine with inhaled oxygen to form water. During a shortage of food or water, camels draw upon this fat for nutrition and moisture. Dromedary camels, native to the Arabian and

Sahara

deserts

, can lose up to 30 percent of their body weight without harm. Camels, nicknamed “ships of the

desert

,” are widely used for transportation, meat, and milk in the Maghreb (a region in Northwest Africa), the

Middle East

, and the Indian Sub

continent

.

People and the Desert

About 1 billion people live in

deserts

. Many of these people rely on centuries-old customs to make their lives as comfortable as possible

Civilizations throughout the

Middle East

and

Maghreb

have

adapted

their clothing to the hot, dry conditions of the Sahara and Arabian

deserts

. Clothing is versatile and based on robes made of rectangles of fabric. Long-sleeved, full-length, and often white, these robes shield all but the head and hands from the

wind

,

sand

, heat, and cold. White reflects sunlight, and the loose fit allows cooling air to flow across the skin.

These robes of loose cloth can be adjusted (folded) for length, sleeves, and pockets, depending on the wearer and the

climate

. A thobe is a full-length, long-sleeved white robe. An abaya is a sleeveless cloak that protects the wearer from

dust

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and heat. A djebba is a short, square pullover shirt worn by men. A kaffiyeh is a rectangular piece of cloth folded loosely around the head to protect the wearer from sun exposure,

dust

, and

sand

. It can be folded and unfolded to cover the mouth, nose, and eyes.

Kaffiyehs

are secured around the head with a cord called an agal. A turban is similar to a

kaffiyeh

, but wrapped around the head instead of being secured with an

agal

.

Turbans

are also much longer—up to six meters (20 feet)!

Desert

dwellers have also

adapted

their shelters for the

unique

climate

. The

ancient

Anasazi peoples of the southwestern United States and northern Mexico constructed huge apartment complexes in the rocky cliffs of the Sonoran

Desert

. These

cliff

dwellings, sometimes dozens of meters off the ground, were constructed with thick, earthen walls that provided

insulation

. Although

temperatures

outside varied greatly from day to night,

temperatures

inside did not. Tiny, high

windows

let in only a little light and helped keep out

dust

and

sand

.

The need to find food and water has led many

desert

civilizations

to become nomadic. Nomadic cultures are those that do not have permanent settlements. In the

deserts

of the

Middle East

and Asia,

nomadic

tent communities continue to flourish. Tent walls are made of thick, sturdy cloth that can keep out

sand

and

dust

, but also allow cool breezes to blow through. Tents can be rolled up and transported on pack animals (usually horses, donkeys, or camels).

Nomads

move frequently so their flocks of sheep and goats will have water and grazing land.

Besides animals like camels and goats, a variety of

desert

vegetation

is found in oases and along the

shores

of

rivers

and lakes. Figs, olives, and oranges thrive in

desert

oases and have been harvested for centuries.

Some

desert

areas rely on resources brought from more

fertile

areas—food trucked in from distant farmlands or, more frequently, water piped from wetter regions. Large areas of

desert

soil are irrigated by water pumped from underground sources or brought by canal from distant

rivers

or lakes. The booming

Inland Empire

of southeastern California is made up of

deserts

(the Mojave and the Sonoran) that rely on water for

agriculture

,

in

dustry

, and residential development.

Canals

and aqueducts supply the

Inland Empire

with water from the Colorado

River

, to the east, and the Sierra Nevada snowmelt to the north.

A variety of

crops

can thrive in these

irrigated

oases. Sugar cane is a very water-intensive

crop

mostly harvested in tropical regions. However,

sugar cane

is also harvested in the

deserts

of Pakistan and Australia. Water for irrigation is transported from hundreds of kilometers away, or drilled from hundreds of meters underground.

Oases in

desert

climates

have been popular spots for tourists for centuries.

Spas

ring the Dead Sea, a saline lake in the Judean

Desert

of Israel and Jordan. The Dead Sea has had

flourishing

spas

since the time of King David.

Air transportation and the development of air conditioning have made the sunny

climate

of

deserts

even more accessible and attractive to people from colder regions. Populations at resorts like Palm

Springs

, California, and Las Vegas, Nevada, have boomed.

Desert

parks, such as

Death Valley

National Park, California, attract thou

sands

of visitors every year. People who

migrate

to the warm, dry

desert

for the winter and return to more temperate

climates

in the

spring

are sometimes called “snowbirds.”

In

rural

areas, hot days turn into cool nights, providing welcome relief from the scorching sun. But in cities, structures like buildings, roads, and parking lots hold on to daytime heat long after the sun sets. The

temperature

stays high even at night, making the city an “island” of heat in the middle of the

desert

. This is called the urban heat island effect. It is less pronounced in

desert

cities than cities built in heavily forested areas. Cities like New York City, New York, and Atlanta, Georgia, can be 5 degrees warmer than the surrounding area. New York was built on wetland

habitat

, and Atlanta was built in a wooded area. Cities like Phoenix, Arizona, or Kuwait City, Kuwait, have a much smaller

urban heat island

effect. They may be only slightly warmer than the surrounding

desert

.

Deserts

can hold economically valuable

resources

that drive

civilizations

and economies. The most notable

desert

resource

in the world is the massive oil reserves in the Arabian

Desert

of the

Middle East

. More than half of the proven

oil reserves

in the world lie beneath the

sands

of the Arabian

Desert

, mostly in Saudi Arabia. The oil

in

dustry

draws companies, migrant workers, engineers, geologists, and biologists to the

Middle East

.

Desertification

Desertification

is the process of productive

cropland

turning into non-productive,

desert

-like environments.

Desertification

usually happens in semi-

arid

areas that border

deserts

.

Human activities are a

primary

cause of

desertification

. These activities include overgrazing of livestock, deforestation, overcultivation of farmland, and poor irrigation practices.

Overgrazing

and

de

forestation

remove plants that anchor the soil. As a result,

wind

and water erode the nutrient-rich topsoil. Hooves from grazing

livestock

(Video) Sardegna - National Geographic Society

compact the soil, preventing it from absorbing water and fertilizers. Agricultural production is devastated, and the economy of a region suffers.

The

deserts

of Patagonia, the largest in South America, are expanding due to

desertification

.

Patagonia

is a major agricultural region where non-native species such as cattle and sheep graze on grassland. Sheep and

cattle

have reduced the native

vegetation

in

Patagonia

, causing loss of valuable

topsoil

. More than 30 percent of the

grasslands

of Argentina, Chile, and Bolivia are faced with

desertification

.

People often overuse natural resources to survive and profit in the short term, while neglecting long-term sustainability. Madagascar, for instance, is a tropical island in the Indian Ocean. Seeking greater economic opportunities, farmers in Madagascar engaged in slash-and-burn

agriculture

. This method relies on cutting and burning

forests

to create fields for

crops

. Unfortunately, at the time farmers were investing in

slash-and-burn

agriculture

, Madagascar experienced long-term

droughts

. With little

vegetation

to

anchor

it, the thin

topsoil

quickly

eroded

. The island’s central plateau is now a barren

desert

.

Rapid population growth also can lead to overuse of

resources

, killing plant life and depleting

nutrients

from the soil. Lake Chad is a source of freshwater for four countries on the edge of the

Sahara

Desert

: Chad, Cameroon, Niger, and Nigeria. These developing countries use Lake Chad’s shallow waters for

agriculture

,

in

dustry

, and

hygiene

. Since the 1960s, Lake Chad has shrunk to half its size.

Desertification

has severely reduced the

wetland

habitats

surrounding the lake, as well as its fishery and grazing lands.

Desertification

is not new. In the 1930s, parts of the Great Plains of North America became the “Dust Bowl” through a combination of

drought

and poor farming practices. Millions of people had to leave their farms and seek a living in other parts of the country.

Desertification

is an increasing problem. Every year, about 6 million square kilometers (2.3 million square miles) of land become useless for cultivation due to

desertification

. The

Sahara

Desert

crept 100 kilometers (39 miles) south between 1950 and 1975. South Africa is losing 300-400 million metric tons (330-441 short tons) of

topsoil

each year.

Many countries are working to reduce the rates of

desertification

. Trees and other

vegetation

are being planted to break the force of the

wind

and to hold the soil. Windbreaks made of trees have been planted throughout the Sahel, the southern border region of the

Sahara

Desert

. These

windbreaks

anchor

the soil and prevent

sand

from invading populated areas.

In China’s Tengger

Desert

, researchers have developed another way to control wandering

dunes

. They

anchor

the drifting

sand

with a gridlike network of straw fences.

Straw

is poked partway into the

sand

, forming a pattern of small squares along the contours of the

dunes

. The resulting fences break the force of the

wind

at ground level, stopping

dune

movement by confining the

sand

within the squares of the grid.

New technologies are also being developed to combat

desertification

. “Nanoclay” is a substance sprayed on

desert

sands

that acts as a binding agent.

Nanoclay

keeps the

sand

moist, clumping it together and preventing it from blowing away.

Deserts Get Hotter

Rising

temperatures

can have huge effects on fragile

desert

ecosystems

. Global warming is the most

current

instance of

climate

change

. Human activities such as burning fossil fuels contribute to

global warming

.

In

deserts

,

temperatures

are rising even faster than the global average. This warming has effects beyond simply making hot

deserts

hotter. For example, increasing

temperatures

lead to the loss of nitrogen, an important

nutrient

, from the soil. Heat prevents microbes from converting

nutrients

to nitrates, which are necessary for almost all living things. This can reduce the already limited plant life in

deserts

.

Climate

change

also affects rainfall patterns.

Climate

scientists predict that

global warming

will lead to more rainfall in some regions, but less rainfall in other places. Areas facing reduced

precipitation

include areas with some of the largest

deserts

in the world: North Africa (Sahara), the American Southwest (Sonoran and Chihuahuan), the southern Andes (

Patagonia

), and western Australia (Great Victoria).

In literature and in legend,

deserts

are often described as hostile places to avoid. Today, people value

desert

resources

and biodiversity. Communities,

governments

, and organizations are working to preserve

desert

habitats

and increase

desert

productivity.

Fast Fact

Devil of a Storm
Dust devils are common in hot deserts. They look like tiny tornadoes, but they start on the ground rather than in the sky. When patches of ground get very hot, the heated air above them begins to rise and spin. This whirling column of hot air picks up dust and dirt. These spinning columns of dirt can rise hundreds of feet in the air.

Fast Fact

Freak Floods
Deserts are defined by their dryness. However, flash floods take more lives in deserts than thirst does.

Fast Fact

Hot and Cold Deserts
The largest hot desert in the world is the Sahara, which is 9 million square kilometers (3.5 million square miles). It isn't the hottest place on Earth, though. That distinction belongs to Death Valley, in California's Mojave Desert. The highest temperature on Earth was recorded there:56.7 C (134.1 F).

The largest polar desert is Antarctica, at 13 million square kilometers (5 million square miles). Antarctica boasts the lowest official temperature recorded on Earth: -89.2 C (-128.6 F), recorded on July 21, 1983.

Fast Fact

Rising from the Ashes
The desert city of Phoenix, Arizona, is named for the mythical desert bird that burns to death only to be reborn, rising from its own ashes. The city of Phoenix was built on top of the ruins of canals built by the Hohokam people between 500 and 1450 CE. The Hohokam used the canals to irrigate their crops. Modern-day residents also rely on an extensive canal system to provide irrigation.

FAQs

What are the 5 types of desert? ›

The world's deserts can be divided into five types—subtropical, coastal, rain shadow, interior, and polar. Deserts are divided into these types according to the causes of their dryness.

What are the 4 types of deserts? ›

There are four types of deserts: subtropical deserts are hot and dry year-round; coastal deserts have cool winters and warm summers; cold winter deserts have long, dry summers and low rainfall in the winter; polar deserts are cold year-round.

Why is there no rain in the desert? ›

Since cool air cannot retain as much water vapor as warmer air can, the excess water precipitates. Moisture blowing in from the ocean is effectively drained, and the air that moves down the ranges' eastern slopes is usually so dry it cannot produce any more rain.

How is the desert biome valuable to society? ›

The desert biome is one of the most important. There are 15 mineral deposit types on our planet and 13 of them are found in deserts. This makes the desert an important place for mineral resources and for local and global economy.

What is the hottest desert in the world? ›

Death Valley holds the record for the highest air temperature on the planet: On 10 July 1913, temperatures at the aptly named Furnace Creek area in the California desert reached a blistering 56.7°C (134.1°F). Average summer temperatures, meanwhile, often rise above 45°C (113°F).

Who is the largest desert in the world? ›

As already mentioned, Antarctic Desert is the largest desert in the world, it is located in the southern hemisphere in the continent of Antarctica. It expands across 14,000,000 kilometres(5,500,000 square miles).

What are 2 interesting facts about the desert? ›

Deserts cover more than one-fifth of the Earth's land area, and they are found on every continent. A place that receives less than 10 inches (25 centimeters) of rain per year is considered a desert. Deserts are part of a wider class of regions called drylands.

Where is the largest sand desert in the world? ›

The Ar Rub' al Khali, or Empty Quarter, covers much of the south-central portion of the Arabian Peninsula and is the largest continuous sand desert on Earth.

Which poisonous animal is commonly found in the desert? ›

Sidewinder

A sidewinder, also known as a horned viper, is one of four species of small venomous snakes that live in the deserts of North America, Africa, and the Middle East. They all crawl in a "sidewinding" pattern. A rattlesnake is a sidewinder (Crotalus cerastes).

Do deserts get cold at night? ›

Temperatures can drop from 100 degrees Fahrenheit during the day to 40 degrees during the night. The main reason why temperatures drop in deserts during the night is because of sand: it is not able to hold heat, and it turns the entire desert hot.

Does it snow in the desert? ›

Snowfall in a hot desert may seem a contradiction but snow has been recorded several times in the Sahara Desert over the last decades, most recently in January 2022. Thus, snowfall may be unusual but is not unprecedented in the region.

How does the desert benefit humans? ›

Deserts provide many benefits that can meet the demands of both the local inhabitants and other surrounding communities. These benefits include water, food supply, medicine and raw materials.

How does the desert affect people's lives? ›

Not only is it difficult for humans to survive in deserts - it is also hard for animals, plants and other forms of life to live. This, in turn, makes it even harder for human life to persist because there is always risk of running out of food.

What is the benefit of desert? ›

Advantage: Abundance of Soil Nutrients

Desert soil holds an abundance of nutrients because of the minute amounts of rainfall and surface runoff, and therefore lends itself easily to agricultural use, provided that an efficient irrigation system is developed.

What is the coldest desert? ›

The largest desert on Earth is Antarctica, which covers 14.2 million square kilometers (5.5 million square miles). It is also the coldest desert on Earth, even colder than the planet's other polar desert, the Arctic. Composed of mostly ice flats, Antarctica has reached temperatures as low as -89°C (-128.2°F).

How hot can a human survive? ›

It is commonly held that the maximum temperature at which humans can survive is 108.14-degree Fahrenheit or 42.3-degree Celsius. A higher temperature may denature proteins and cause irreparable damage to brain.

Which is hotter Death Valley or the Sahara desert? ›

They also have colder winters. The Sahara Desert falls within this region, yet Death Valley, California still records higher temperatures.

Which country is mostly desert? ›

China has the highest number of deserts (13), followed by Pakistan (11) and Kazakhstan (10). Other countries in Asia that have deserts include Afghanistan, Bahrain, Kyrgyzstan, Iran, Iraq, Jordan, the United Arab Emirates, Syria, and Oman.

What is the most famous desert? ›

List of deserts by area
RankNameLocation
1Antarctic desertAntarctica
2Arctic DesertEastern Europe Northern America Northern Asia Northern Europe
3Sahara DesertEastern Africa Middle Africa Northern Africa Western Africa
4Great AustralianAustralia
30 more rows

Where is the smallest desert in the world? ›

It's located just outside of Carcross, in Yukon, Canada. Known as Carcross Desert, the site might just be the smallest desert in the world.

How many deserts are in the world? ›

How many deserts are in the world? There are 23 deserts in the world. What are the most famous deserts in the world? Some famous deserts in the world are the Sahara, Antarctic, Arctic, Gobi and Namib deserts.

Why do people live in deserts? ›

Their traditional lifestyle has adapted to these extremely arid conditions. Their nomadic lifestyle means they do not settle in one area for long. Instead, they move on frequently to prevent exhausting an area of its resources. They have herds of animals which are adapted to living in desert conditions, such as camels.

How much of the earth is desert? ›

The total land surface area of Earth is about 57,308,738 square miles, of which about 33% is desert and about 24% is mountainous.

What is the driest desert in the world? ›

The Atacama is the driest place on earth, other than the poles. It receives less than 1 mm of precipitation each year, and some areas haven't seen a drop of rain in more than 500 years.

Does it rain in a desert? ›

Precipitation. Deserts get about 250 millimeters (10 inches) of rain per year—the least amount of rain of all of the biomes.

What is the 2nd largest desert in the world? ›

Arctic Desert

The cold Arctic Desert is the second largest desert in the world, located in the northern polar region of Earth. The desert stretches across an area of the Arctic Ocean 2,000 km from east to west and 1,000 km from north to south, covering a number of island groups of the north coast of Norway and Russia.

Who owns the Sahara desert? ›

The enormous desert spans 10 countries (Algeria, Chad, Egypt, Libya, Mali, Mauritania, Morocco, Niger, Sudan and Tunisia) as well as the territory of Western Sahara, a former Spanish colony that was annexed by Morocco in 1975, though control of the region is disputed by the Indigenous Saharawi people, the BBC reported ...

What's under Sahara Desert? ›

Beneath the sands of the Sahara Desert scientists have discovered evidence of a prehistoric megalake. Formed some 250,000 years ago when the Nile River pushed through a low channel near Wadi Tushka, it flooded the eastern Sahara, creating a lake that at its highest level covered more than 42,000 square miles.

What is the top predator in the desert? ›

At the very top of the food chain are the apex predators of the desert ecosystem. These include mountain lions, bobcats, coyotes, and golden eagles. Coyotes often travel in packs and make their howls echo giving the impression of sounding like more coyotes than there actually are.

What is the deadliest plant in the desert? ›

Attenborough spiked by most dangerous plant in desert

Beware the teddy bear cholla cactus, the most dangerous plant in the desert. Even thick, elbow-length protective gloves could not stop Sir David Attenborough's hand being stabbed by the vicious cactus spikes, which are as sharp as glass and barbed like a fishhook.

Which most evil looking snake is found in deserts of America? ›

In the dry, rocky deserts of America lives a snake called 'Rattlesnake'. It is called rattlesnake because it makes a sound with its tail. Another animal which lives in the desert is a Mongoose. Mongooses love to search for food in groups.

What happens when it rains in the desert? ›

Effects of Desert Rains

Torrential storms can flood dry riverbeds and wadis, producing flash floods in areas that may not have seen moisture in months. The ground is so dry and porous, however, that it will soak up the water very quickly once the downpour ends.

How cold is space? ›

Space is very, very cold. The baseline temperature of outer space is 2.7 kelvins (opens in new tab) — minus 454.81 degrees Fahrenheit, or minus 270.45 degrees Celsius — meaning it is barely above absolute zero, the point at which molecular motion stops.

Does the desert have 4 seasons? ›

There are four types of deserts: subtropical deserts are hot and dry year-round; coastal deserts have cool winters and warm summers; cold winter deserts have long, dry summers and low rainfall in the winter; polar deserts are cold year-round.

Did it snow in Sahara Desert in 1979? ›

Snowfall has occurred in the Sahara Desert for the fifth time in 42 years. Earlier, snowfall occurred in the desert in 1979, 2016, 2018, and 2021. North Africa experienced extreme temperatures in the summer and winter months last year.

How cold is the Sahara desert at night? ›

That's because temperatures in the Sahara can plummet once the sun sets, from an average high of 100 degrees Fahrenheit (38 degrees Celsius) during the day to an average low of 25 degrees Fahrenheit (minus 4 degrees Celsius) during the night, according to NASA.

Does rain fall in Sahara Desert? ›

The area receives little rainfall, in fact, half of the Sahara Desert receives less than 1 inch of rain every year.

Is it healthy to live in the desert? ›

There are some benefits of living in the desert that can come to your life if you have issues related to mobility, like arthritis or osteoporosis. A combination of the heat and sun can help loosen your muscles and joints, aiding in your movement and decreasing pain levels.

What would happen if the desert disappeared? ›

If there were no deserts, all of the life (plants and animals) that are adapted to a desert environment would either 1) die, or 2) adapt to a different environment in order to survive. Answer 3: Deserts form because of the location of mountains and because of the way air circulates around the planet.

What was the Sahara desert before it became a desert? ›

No, around 11,000 years ago, the Sahara wasn't a desert at all. Instead, it was covered in plant life. It also held bodies of water. There was even a “megalake” that covered over 42,000 square miles.

What do you call a person who lives in the desert? ›

The English word bedouin comes from the Arabic badawī, which means "desert dweller", and is traditionally contrasted with ḥāḍir, the term for sedentary people.

Why do old people move to the desert? ›

Senior living in the desert comes with many benefits and advantages. Some people enjoy living in the desert because of the weather, while others enjoy the environment that comes with living with so many other seniors.

Why is life very difficult in desert? ›

Usually, they have very little rainfall and barren land, making the climate extremely dry and hard for plants and animals to survive.

What are 3 disadvantages of deserts? ›

Disadvantages are insufficient rainfall, high evaporation, and large scale erosion.

How do you enjoy living in the desert? ›

Desert living: 9 tips for staying comfortable in a dry climate
  1. Keep Your HVAC System in Good Shape. ...
  2. Run a Humidifier. ...
  3. Stay Hydrated and Moisturized. ...
  4. Shade Your Vehicles. ...
  5. Improve Your Home. ...
  6. Limit Indoor Heat Generating Items. ...
  7. Use Nature to Your Advantage. ...
  8. Keep Air Moving.
15 Sept 2020

What are the 3 types of desert? ›

The main types of deserts include hot and dry deserts, semi-arid deserts, coastal deserts, and cold deserts.

How many deserts are there? ›

How many deserts are in the world? There are 23 deserts in the world. What are the most famous deserts in the world? Some famous deserts in the world are the Sahara, Antarctic, Arctic, Gobi and Namib deserts.

Which country is mostly desert? ›

China has the highest number of deserts (13), followed by Pakistan (11) and Kazakhstan (10). Other countries in Asia that have deserts include Afghanistan, Bahrain, Kyrgyzstan, Iran, Iraq, Jordan, the United Arab Emirates, Syria, and Oman.

What's the oldest desert in the world? ›

Standing atop one of the tallest dunes on Earth, it felt as though the sand beneath our feet stretched into infinity. With its red dunes rolling endlessly into the ocean, the Namib is the oldest desert in the world — a sea of silica stretching along Namibia's entire Atlantic coast.

How often does it rain in the desert? ›

Deserts get about 250 millimeters (10 inches) of rain per year—the least amount of rain of all of the biomes.

Does the desert have 4 seasons? ›

There are four types of deserts: subtropical deserts are hot and dry year-round; coastal deserts have cool winters and warm summers; cold winter deserts have long, dry summers and low rainfall in the winter; polar deserts are cold year-round.

How much of the world is desert? ›

Deserts cover more than one-fifth of Earth's land area, and they are found on every continent. A place that receives less than 25 centimeters (10 inches) of rain per year is considered a desert.

What is so special about deserts? ›

Deserts may seem lifeless, but in fact many species have evolved special ways to survive in the harsh environments. Far from being barren wastelands, deserts are biologically rich habitats with a vast array of animals and plants that have adapted to the harsh conditions there.

What kind of people lives in the desert? ›

Traditional adaptations to arid conditions

One example of people who live in the desert is the Bedouin tribe. They live in desert areas in the Middle East. Their traditional lifestyle has adapted to these extremely arid conditions. Their nomadic lifestyle means they do not settle in one area for long.

Which country has no desert? ›

Europe has no desert. Africa, the world's hottest landmass, has no cold climate. Australia has no active volcanoes. Australia has only one country, Australia.

What is the most famous desert? ›

List of deserts by area
RankNameLocation
1Antarctic desertAntarctica
2Arctic DesertEastern Europe Northern America Northern Asia Northern Europe
3Sahara DesertEastern Africa Middle Africa Northern Africa Western Africa
4Great AustralianAustralia
30 more rows

What state has the most desert? ›

California is 25% desert. There are three main deserts: the Mojave Desert, the Colorado Desert, and the Great Basin Desert.

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