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Bandan 80 plz are you there​

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Answer:

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.

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