A desert is a landscape region that receives very little precipitation or regions where the potential evaporation rate is twice as high as the precipitation. For a piece of land to be classified as a desert it must receive less than 250 mm of precipitation per year. Because of such a low level of precipitation deserts are known for supporting very little forms of life.
The world's deserts are divided into four categories. Subtropical deserts which are the hottest, with parched terrain and rapid evaporation. Although cool coastal deserts are located within the same latitudes as subtropical deserts, the average temperature is much cooler because of frigid offshore ocean currents. Cold winter deserts are marked by stark temperature differences from season to season, ranging from 100° F (38° C) in the summer to 10° F (–12° C) in the winter. Polar Regions are also considered to be deserts because nearly all moisture in these areas is locked up in the form of ice.
With that said though, with a closer look deserts still have a wide variety of life. These desert creatures normally remain hidden, especially true during the daylight hours, to preserve moisture.
Roughly one third of the world's land surface is desert. Most commonly deserts around the world have similar characteristics. Sand Dunes can often times be present in deserts as the desert soil is mostly comprised of sand. Typically rocky terrain will be exposed in certain regions, which will reveal a sparseness of vegetation, and soil development. Wind driven forces are major factors in what shape desert landscapes.
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