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How's a Barchan dune shaped?

+3 pts

Crescent-shaped

Line-shaped

Star-shaped

Round-shaped

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Choice "A": Crescent-shaped % of users selected this choice.
Choice "B": Line-shaped % of users selected this choice.
Choice "C": Star-shaped % of users selected this choice.
Choice "D": Round-shaped % of users selected this choice.

Image credit: Fernando Paredes Murillo.