Atacama Desert

The Atacama is a very dry place.

It sits in Chile near the ocean. Two tall mountain chains sit near it. These mountains block the rain from coming. This makes the land very dry.

Some plants can live there. Some flowers bloom when it rains. The land looks like the planet Mars.

Scientists use the desert to test tools for space. It is a truly amazing place to explore.

The Atacama Desert is a very dry place.

It sits on the coast of South America. It is in the north of Chile. The desert is between two mountain chains. These are the Andes and the Chilean Coast Range. The mountains are so high they block moisture. This creates a rain shadow. This means rain cannot reach the desert easily.

Because of this, it is the driest nonpolar desert on Earth. Some parts of the desert have never seen rain. The weather stays mild most of the year. It does not get as hot as other deserts.

The soil looks like the planet Mars. Because of this, scientists study the desert. They use it to test tools for space missions. Some plants and animals live there too. A plant called llareta grows very slowly. It looks like a thick green pillow. You can also find cacti and lizards.

Pink flamingos live near the salt flats.

The Atacama Desert is a vast, dry plateau in South America.

It sits along the Pacific coast in northern Chile. The desert stretches west of the Andes Mountains. It covers a huge area of land. Some parts of it are even part of southern Peru. This place is famous for being extremely dry. In fact, it is the driest nonpolar desert on our planet. It is also the largest fog desert in the world.

Nature uses mountains to keep the desert dry. The Andes and the Chilean Coast Range surround the area. These mountains are very high. They act like walls to block moisture. This creates something called a rain shadow. Water from the Pacific and Atlantic Oceans cannot get through. This makes the weather very dry. The cool Humboldt ocean current also helps keep the air dry. Because of this, the air stays mild most of the year.

This desert has been dry for a very long time. Some scientists think it might be the oldest desert on Earth. It has been dry since the Middle Miocene period. This was about 33 million years ago. Long ago, the desert was not always so bare. A place called Pampa del Tamarugal used to be a woodland. People cut down the trees for firewood during the 18th and 19th centuries. Now, the landscape looks very different.

Life in the Atacama is a hard job for living things. Some parts are so dry that nothing can live there. However, other areas get moisture from a thick fog called the camanchaca.

This fog helps plants like cacti and lichens grow. One special plant is the llareta. It grows in dense, green shapes that look like pillows. It grows very slowly, sometimes taking 3,000 years to mature. You can also find pink Andean flamingos near the salt flats.

The Atacama looks like another world. Its rocky, dusty soil is very similar to the surface of Mars.

Because of this, NASA uses the desert to test tools. They want to see if instruments work before sending them to space. Scientists even use the desert to study the very first life forms on Earth. Sometimes, the desert surprises us with color. If there is enough rain, a desert flowering happens.

This turns the dry land into a beautiful sight.

The Atacama Desert is a massive desert plateau located on the Pacific coast of South America. It sits in the northern part of Chile, stretching across a strip of land just west of the Andes Mountains.

The desert covers a vast area that grows even larger if you include the barren lower slopes of the Andes. It holds the title of the driest nonpolar desert on Earth. It is also the second driest desert overall, following specific spots in the McMurdo Dry Valleys. Additionally, it is recognized as the largest fog desert in the world.

The extreme dryness of the Atacama is caused by several complex geographic mechanisms. The desert is positioned between two massive mountain chains: the Andes to the east and the Chilean Coast Range to the west. These mountains are high enough to block moisture advection, which is the movement of water vapor through the air. This creates a two-sided rain shadow effect that prevents moisture from the Pacific or Atlantic Oceans from reaching the plateau.

Furthermore, a constant temperature inversion helps maintain this aridity. This inversion is caused by the cool, north-flowing Humboldt ocean current and a strong Pacific anticyclone. These factors work together to keep the air dry and the temperatures consistently mild.

Geographically, the Atacama ecoregion forms a continuous strip for nearly 1,000 kilometers. It runs along the northern third of Chile, from near Arica in the north to near La Serena in the south.

The boundaries of the desert are a subject of scientific discussion. The National Geographic Society includes the coastal area of southern Peru as part of the Atacama. However, other sources argue that the Peruvian portion is a different ecosystem called the Pampas de la Joya desert. To the east, the desert meets the less arid Central Andean dry Puna ecoregion. To the south, it borders the Chilean Matorral ecoregion.

The history of the Atacama's aridity spans millions of years. It may be the oldest desert on Earth. Hyper-aridity has likely existed since at least the Middle Miocene epoch. This began roughly 33 million years ago with the establishment of a proto-Humboldt current and the opening of the Tasmania-Antarctic passage. This passage allowed cold currents to move along the west coast of South America. This change prevented warm, humid air from the Amazon Basin from traveling to the Atacama.

While there were brief periods of higher humidity in the past, the desert has remained remarkably dry for much of its history.

Despite the harsh climate, life has found ways to adapt to this environment. The desert contains over 500 species of flora. Many plants rely on the camanchaca, a marine fog that provides essential moisture.

The llareta is a remarkable plant that grows at high altitudes. It forms dense, pillow-like shapes to retain heat. Because it grows at a rate of only 1 centimeter per year, some plants may be over 3,000 years old. You can also find various cacti, such as the candelabro, and animals like the Vallenar toad or the Andean flamingo.

In rare years with enough rain, the region experiences a "desert flowering" phenomenon.

The Atacama is also famous for its striking resemblance to the planet Mars. The dusty, rocky landscape and soil composition are very similar to the Martian environment.

Because of this, NASA and other scientists use the desert as a testing ground. They use it to simulate Mars expeditions and to test instruments for future space missions. In 2003, researchers even duplicated tests used by the Viking Mars landers in the soil near Yungay. They found that the soil was so dry it could even hide signs of life from certain tests. This makes the Atacama a vital site for understanding how life might exist on other planets.

Finally, the Atacama's unique conditions connect it to broader scientific studies of Earth's history. In December 2023, scientists reported finding a "dark microbiome" of unfamiliar microorganisms there.

Researchers also believe parts of the Puna de Atacama may resemble Earth during the Archean eon. This was a time when the first life forms appeared on our planet. By studying these extreme environments, scientists gain insight into the very beginnings of life and the limits of biology.