Question

define barchans .....please

Answer 1

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$<b>A barchan or barkhan dune is a crescent-shaped dune. The term was introduced in 1881 by Russian naturalist Alexander von Middendorf, for crescent-shaped sand dunes in Turkestan and other inland desert regions. Barchans face the wind, appearing convex and are produced by wind action predominantly from one direction. </b>$

Answer 2

Answer:

Moon shaped, live and narrow sand-ridges which grow parallel to the direction of the prevailing wind and remain in a fixed position.