How are costal dunes formed?
Answers
Answer:
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Dunes are formed when wind and waves transport sand onto the beach. The ultimate source of the sand is often glacial till that resides offshore, or is eroded from nearby cliffs by waves and transported along the shoreline by longshore currents (see coastal sediment processes). Rivers can also transport sand to the coast from inland deposits. Waves wash this sand up on the beach, and also remove it during storms.
One beach can vary quite substantially with the seasons. During the winter, stronger waves pick up more sand (but leave behind larger sediment), causing the beach to be steeper and coarser. In summer, gentle waves transport sand onshore and the beach takes on a shallower slope with finer sand.
Answer:
A dune is a mound of sand formed by the wind, usually along the beach or in a desert. dunes from when blows sand into a sheltered area behind an obstacle. Dunes grown as grains of sand accumulate. ......Dunes can also be formed by strong current breath the water
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