The desert biome covers about one-fifth of Earth's surface. This biome has a layer of soil that can either be sandy, gravelly, or stony, depending on the type of desert. During the day, desert temperatures rise to an average of 38°C (a little over 100°F). At night, desert temperatures fall to an average of -3.9°C (about 25°F). At night, desert temperatures fall to an average of -3.9 degrees Celsius (about 25 degrees Fahrenheit). Deserts are areas that have hardly any rain, are extremely dry and are usually very hot. Animals and plants have adapted to the harsh environment so they can survive the extreme conditions. Although most deserts, such as the Sahara of North Africa and the deserts of the southwestern U.S., Mexico, and Australia, occur at low latitudes, another kind of desert, cold deserts, occur in the basin and range area of Utah and Nevada and in parts of western Asia.

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