Deserts are arid regions, generally receiving less than 25 centimeters (10 inches) of precipitation a year, or regions where the potential evaporation rate is significantly greater than the precipitation. In most cases, deserts possess a high average temperature with large differences between daytime and nighttime temperatures. Arid regions can also be defined as environments in which water is the limiting factor for biosystems . This means that survival
This desert in Valley of the Tsauchab, Namibia illustrates the vegetation, desert crust, and occasionally pooled water that characterize these arid regions. Annual rainfall in Namibia’s coastal desert is 50 millimeters (about 2 inches).
of life in these regions involves a constant struggle to obtain this limited commodity and to draw the maximum benefit from it. Read more
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