Regions that receive less than 10 inches (250 mm) of rainfall on average per year are considered as deserts.
All of Antarctica is considered a polar desert region.
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Antarctica is considered a true desert based on its lack of precipitation. The Arctic is not considered to be a true desert as much of it is not land but sea ice and what land is found there is considered to be tundra, a distinct biome, different from a desert.
Both the north and south polar regions are considered to be ice deserts. This is because the regions have almost no precipitation throughout the year.
The Atacama Desert in northern Chile is considered as one of the driest regions on earth.
A desert is an area with a small amount of precipitation (rainfall) per year. Since the polar regions are so cold they get next to no rainfall so are considered desert due to that fact.
Both are considered to have less than 25 centimeters of rain each year
Las Vegas is generally considered to be within the Mohave Desert geographically. It is in an ecological transition zone between the Great Basin Desert and the Sonoran Desert near the edge of the Colorado Plateau. There is some disagreement on the naming of the desert regions.
There is no such thing as half-desert. There are semi-desert regions and semi-arid regions which are the same thing. They are regions that resemble the desert in some respects but receive more rainfall than the desert. These regions would average more than 10 inches (250 mm) of precipitation per year.
low desert is a name for the desert of California regions that includes Colorado desert and Yuha desert
There are about 26 major desert regions of the world. To view the list and the locations of these deserts click on this link
The Mojave is the largest desert in California.