how are beaches and sand dunes form
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Beaches and dunes
A beach along a coast is formed by the build up of tiny pieces of rock. Rocks that fall into the sea are tossed around and broken down by waves into shingle (small pebbles) and sand. ... On some beaches, wind blows off the sea and rolls dry sand inland, creating hills of sand called sand dunes.
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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. ... Dunes can also be formed by strong currents beneath the water.
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