A desert is a region or area of land where, usually, less than 25 centimeters of rain falls a year
By this definition, about one-third of the Earth's land surface is covered by deserts
Most of the deserts are very hot, such as the Sahara in North Africa, but some are extremely cold, such as the Gobi in Asia
The driest desert is the Atacama in South America
One thing the deserts have in common is that most creatures find it very difficult to survive in them
In hot deserts, the temperature can rise to more than 45 degrees Celsius in the daytime, though it may turn very cold at night
Not many animals, especially large mammals, can stand such conditions
They cannot store enough water in their bodies, and the heat is too great to bear
However, small animals like rodents and some lizards and snakes have adapted to living there
A desert is a region or area of land where, usually, less than 25 centimeters of rain falls a year
By this definition, about one-third of the Earth's land surface is covered by deserts
Most of the deserts are very hot, such as the Sahara in North Africa, but some are extremely cold, such as the Gobi in Asia
The driest desert is the Atacama in South America
One thing the deserts have in common is that most creatures find it very difficult to survive in them
In hot deserts, the temperature can rise to more than 45 degrees Celsius in the daytime, though it may turn very cold at night
Not many animals, especially large mammals, can stand such conditions
They cannot store enough water in their bodies, and the heat is too great to bear
However, small animals like rodents and some lizards and snakes have adapted to living there
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