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[[Image:desert-7.jpg|right|250px|thumb]]
'''Deserts''' are areas of extreme heat and dryness, just as most of us envision them. Deserts are arid regions, characteristically receiving less than 5 inches of [[precipitation]] a year. In some deserts, the amount of [[evaporation]] is greater than the amount of rainfall, making them very dry. Semi-arid deserts average 5 to 10 inches of annual precipitation. Desert moisture typically occurs in brief intervals and is unpredictable from year to year. One-third of the earth is arid to semiarid (being either ''desert'' or ''semidesert'').
'''Deserts''' are areas of extreme heat and dryness, just as most of us envision them. Deserts are arid regions, characteristically receiving less than 5 inches of [[precipitation]] a year. In some deserts, the amount of [[evaporation]] is greater than the amount of rainfall, making them very dry. Semi-arid deserts average 5 to 10 inches of annual precipitation. Desert moisture typically occurs in brief intervals and is unpredictable from year to year. One-third of the earth is arid to semiarid (being either ''desert'' or ''semidesert'').
Because they are poised in such harsh extremes of heat and aridity, deserts are among the most fragile [[ecosystem]]s on the planet.
Because they are poised in such harsh extremes of heat and aridity, deserts are among the most fragile [[ecosystem]]s on the planet.
[[Category:Ecology]]