In the Indian Desert, a barchan is what type of feature?

Correct answer: Crescent shaped sand dune

Direct answer: Option A, a barchan is a crescent-shaped sand dune. A dune is a mound or ridge of sand built and moved by wind. In a dry desert, where loose sand is available and vegetation is sparse, wind shapes the sand. A barchan usually forms where wind blows mainly from one dominant direction and sand supply is limited; its curved shape has horns pointing generally downwind. Option A is correct because it describes the characteristic landform. Option B is wrong: a delta is sediment deposited where a river enters a lake or sea, not a wind-built desert dune. Option C is wrong: a glacial lake is formed by ice erosion or melting, not by desert wind. Option D is wrong: a coral island is built mainly from coral material in warm shallow seas. Therefore, the key chain is desert + wind + sand + crescent shape. Memory cue: barchan begins with ‘bar’ only as a word cue, but remember the real image—a crescent of sand made by wind.