Offshore bars form when sediment is transported on and off a beach. Destructive waves remove sediment from the beach and form the offshore bar.

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The beach is the area between the lowest spring tide level and the point reached by the storm waves in the highest tides.

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A sandy beach is usually formed in a sheltered bays, where low energy, constructive waves transport material onto the shore.

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A sand dune is a small ridge or hill of sand found at the top of a beach, above the reach of the waves.

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Beaches, sand dunes, spits and bars.

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