Using well labelled diagram(s) explain how Barchan is formed.

Answer:

-Prevailing wind is interrupted by an obstacle leading to deposition of sand around the obstacle where sand piles up to form a low hill of sand

-Wind pushes more sand over the sand hill to form a gently sloping convex windward.

-The wind cross over the hill and form eddy currents on the leeward side which push sand forward and side ways to create a shallow depression and a steep concave slope.
- The sand pushed forward form sharp edges or horns on the leeward side.
- The process forms a crescent-moon shaped low ridge of sand at
a right angle to the prevailing wind direction called barchans

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