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Unformatted text preview: Desserts, Glaciers, and Climate Tonia Pieper Axia College at University of Phoenix Science 245 Geology When it comes to the types of dunes, there are five different types. They are accumulations of loose, well sorted, windblown sand grains in wave-like mounds or ridges whose characteristic shapes are maintained by periods of wind-induced, grain-by-grain movement. Longitude dunes have long, narrow ridges, elongate parallel to the wind, caused by a larger dune that has had it smaller side that were blown away. They are usually sharp-crested and are common in the Sahara. Barchan dunes are crescent that point downwind across an irrigated field. They are generally wider than they are long. They are formed under winds that blow only in one direction. These types of dunes move faster over the desert surfaces than any other dune. The largest dune is types of dunes move faster over the desert surfaces than any other dune....
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