Asked in Deserts

How much of the earth is covered by deserts?



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Almost a third of Earth's land surface is occupied by desert, most of it icy or rocky rather than covered with sand dunes. And a substantial percentage of it supports animal and plant life.

Desert areas are defined as those regions with less than 250 mm (10") of rainfall per year, or with a net loss of water due to evaporation. This includes about 10% of the Earth's total surface, or about 33% of the Earth's land surface.