Deserts are areas that receive little precipitation, classified as an area that receives less that 250 millimeters (10 inches) of annual precipitation on average. The classification also takes into account the potential evapotranspiration, or the amount of water that could be evaporated in the region. Because of the lack of precipitation, deserts are often dry and barren in landscape, and commonly thought of as having hot climates. However, deserts can be hot or cold, and they exist in regions all across the world. The largest two deserts on Earth are both cold deserts, which are covered in ice and snow. The largest deserts in the world are polar deserts: the Antarctic Desert and the Arctic Desert. The Antarctic Desert covers an area of 13,829,430 square kilometers over the South Pole. Antarctica is the most extreme continent on Earth, as the coldest, driest and windiest place in the world ,and the highest elevation. The Arctic Desert is the northernmost region of the Earth, co...
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