What are 'barchans'?
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Barchans are crescent shaped sand dunes produced by the action of wind in one direction.the convex side of the barchans is towards the direction of wind
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Answer Explanation:Barchan, also spelled Barkhan, crescent-shaped sand dune produced by the action of wind predominately from one direction. ... They gradually migrate with the wind as a result of erosion on the windward side and deposition on the leeward side. The rate of migration ranges from about a metre to a hundred metres per year.
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