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Steve Kadel, Glendale Community College Deserts and Wind Action Physical Geology 11/e, Chapter 13
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Deserts A desert is any arid region that receives less than 25 cm of precipitation per year In spite of low rainfall, running water is the predominant force shaping most desert landscapes Rare and often violent flash flood events produce most desert erosion
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Distribution of Deserts Deserts can be found anywhere that the atmosphere (air) is usually dry Most deserts are associated with areas where air is descending Globally, hot, moist air rises in the tropics, and dry air descends near 30° north and south latitude Rain shadow deserts form downwind of where moist air rises over high mountain ranges
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Streambeds flow intermittently , typically during/after heavy rains Most of the time, desert streambeds are dry Most deserts lack through-flowing streams Many desert regions have internal drainage , such that streams drain into landlocked basins that slowly fill with sediments Most rain in desert regions comes from occasional, often violent, thunderstorms, producing flash floods Desert
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