what are sand dune ?
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A dune is a mound of sand formed by the wind, usually along the beach or in a desert. Dunes form when wind blows sand into a sheltered area behind an obstacle. Dunes grow as grains of sand accumulate. Every dune has a windward side and a slipface.
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a dune is a mound of sand formed by wind, usually along the beach or deserts
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