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What are "dunes"?

Answer» a dune is a hill of loose sand built by aeolian processes (wind) or the flow of water. Dunes occur in different shapes and sizes, formed by interaction with the flow of air or water. ... The valley or trough between dunes is called a slack.
Dunes are temporary mounds of sand found mainly in deserts and formed due to wind
i guess its Duns.The longitudinal valley lying between lesser Himalaya and the Shiwaliks are known as Duns.\xa0Dehra Dun, Kotli Dun and Patli Dun are examples of the Duns.
Dunes are the small valleys in between the Himalayan Mountains


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