Which of the following processes is responsible for producing the sand dunes in western Rajasthan? (1) Wind erosion (2) Erosion by water (3) Wind deposition (4) Mechanical weathering

Which of the following processes is responsible for producing the sand dunes in western Rajasthan? (1) Wind erosion (2) Erosion by water (3) Wind deposition (4) Mechanical weathering
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(3) Wind deposition Explanation: In physical geography, a dune is a hill of sand built either by wind or water flow. Dunes occur in different forms and sizes, formed by interaction with the flow of air or water. Most kinds of dunes are longer on the windward side where the sand is pushed up the dune and have a shorter "slip face" in the lee of the wind. The origin of sand dunes is very complex, but there are three essential prerequisites: (1) An abundant supply of loose sand in a region generally devoid of vegetation (such as an ancient lake bed or river delta); (2) a wind energy source sufficient to move the sand grains: and (3) a topography whereby the sand particles lose their momentum and settle out.
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