Answer:
1.The air must be moving at least 17 miles per hour to be able to pick up sand grains. ... As more and more sand grains pile up, the angle of the leeward face ... The last type is called a parabolic dune, and looks like an inside out barchan dune.
2.Wind erosion is referred to as eolian erosion. ... Wind cannot carry as large particles as flowing water, but easily pick ups dry particles of soil, sand and dust and carries them away. Wind generally causes erosion by deflation and/or abrasion. Wind breaks are often planted by farmers to reduce wind erosion
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