Barchans
Wind blows in one direction for a long time carrying sand. Sand deposition occurs around an obstacle such as vegetation or rock. Accumulation of more sand leads to formation of bigger mound of sand. Wind carry sand forward along the edges of the mound leading to the development of horns, leading to formation of a crescent moon-shaped feature known as barchan.
Seif Dunes
Are formed from chains of barchans where cross winds interrupt prevailing winds. Cross winds carry sand from side to side and this breaks the crescent shape of the barchans leading to longitudinal deposition called seif dunes.
eddynightsy answered the question on April 17, 2018 at 11:10
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