explian how sand dunes are made
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Sand dunes are created when wind deposits sand on top of each other until a small mound starts to form. As these dunes collapse they move in the same direction as the wind, and if there is no wind moving in the opposite direction or any obstacles in its path, barchan dunes are formed.
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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
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