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10 - EOLIAN ARID LANDSCAPES W IND works as an agent of...

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3/25/10 EOLIAN & ARID LANDSCAPES ** WIND * works as an agent of erosion, transport, & deposition * eolian (aeolian) comes from the Greek, for the Greek ruler of the winds, Aeolus * most effective in areas of little or no vegetation, & little precipitation ** Eolian Erosion: 2 primary processes Deflation : process whereby wind sweeps along a surface carrying away the finest particles , leaving behind the larger particles and fragments. Desert pavement : a landscape as a result of deflation , Large pebbles help protect against further deflation of the remaining fine particles Blowout hollows or depressions : shallow desert basin created by deflation; may be small (<1m) or large (hundreds of meters) in diameter. Abrasion : grinding of surfaces with a “Sandblasting” action by windblown particles. * restricted to a layer only 1-2 meters above the surface * amount of erosion controlled by: rock hardness, wind velocity, & wind constancy Ventifacts : rocks which bear evidence of wind abrasion polished, grooved, pitted; usually <20cm in size one side sand blasted forming a 30 degree slope to it. Yardangs : low, keel-shaped ridges or streamlined rock structures that form parallel to the most effective wind direction up to 50 m tall, 1 km wide, and 20 km long; wind blows from steep, higher end; the
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Sphinx may originally have been a yardang up to 50 m tall, 1 km wide, & 20 km long; wind blows from steep, higher end; the Sphinx may originally have been a yardang which was later sculptured into its familiar shape. ** Eolian Transport: * what is transported & how far controlled by wind velocity & particle size * wind not as important in weathering per se, but in moving the weathered material
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