Grasslands provide habitat for various species of animal life. During dry season fires can destroy large sections of grasslands. A desert is an area where little rain falls and few kinds of plants grow. Deserts are made of sand, bedrock, gravel, boulders, and soil. When the wind blows, sand piles up, and dunes are formed.
Deserts can take the form of flat land, mesas, and mountains.
Deserts are located in all parts of the world, including tropical and polar regions. Desert life is not easy for plants or animals. Although there is little rainfall, deserts have a water supply that is underground. This water sometimes rises to the surface. A fertile green area called an oasis may be found near such a water source.