Deserts of the World

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One thing all deserts have in common is they are arid, or dry. Most experts agree a desert is an area of land receiving no more than ten inches of precipitation a year. The amount of evaporation in a desert often greatly exceeds the annual rainfall. In all deserts, there is little water available for plants and other organisms.Deserts are found on every continent and cover about one-fifth of Earth's land area.