what do you mean by sand dunes
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A sand dune is a low hill like structure which is formed by the deposition of sand.
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A sand dune is a mount, hill or ridge of sand that lies behind the part of the beach affected by tides. They are formed over many years when windblown sand is trapped by beach grass or other stationary objects. ... Without vegetation, wind and waves regularly change the form and location of dunes.
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