Sandbars are slim, uncovered areas of sand and sediment just off the beach. During the summer, waves retrieve sand from sandbars and construct the beach back up again. These seasonal changes cause beaches to be wider and have a mild slope in the summertime, and be narrower and steeper within the winter.
Coastlines that are protected against waves and winds will tend to permit finer sediments such as clay and mud to precipitate creating mud flats and mangrove forests. The shape of a beach is dependent upon whether the waves are constructive or damaging, and whether the material is sand or shingle. Waves are constructive if the interval between their wave crests is long sufficient for the breaking water to recede and the sediment to settle earlier than the succeeding wave arrives and breaks. The coast is the a part of the land that’s near the ocean or ocean.
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