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Geography

Desert

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Deserts are hot during the day and cold at night. Animals and plants that live in deserts have adapted to survive in these harsh conditions.

Characteristics and climate of deserts

See where deserts are found on this biomes map.

Deserts have extreme temperatures. During the day the temperature may reach 50°C, when at night it may fall to below 0°C. Deserts have less than 250 mm of rainfall per year. The rain can be unreliable. Most deserts are found between 20° and 35° north and south of the equator.

Climate graph for the Sahara Desert

Climate graph for the Sahara Desert

The Sahara is the largest desert, covering 9 million km2.

There are three factors which form desert areas:

  1. the presence of high pressure, creating cloud-free conditions
  2. cold ocean currents
  3. mountain ranges to create rain shadows
Diagram of the rain shadow effect in South America

Diagram of the rain shadow effect in South America

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Back to Ecosystems - the living world index

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