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How are sandy beaches formed

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Devi P

on 20 April 2010

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Transcript of How are sandy beaches formed

How are sandy beaches formed Wave and tidal actions transport sand, pebbles, sea shells and gravel to the shorelines of oceans seas and lakes. The sand, pebbles, and gravels were either transported by erosion from the continental landmass by rivers and streams, or created by the mechanical weathering of wave actions against rock formations near the shore. Wind and storms can deposit the rock and shell particles further inland, creating a gently sloped beach. Sand comes from the grinding down of rocks and other debris into small particles which, in turn, becomes sand. This occurrence could be a result of the ocean or wind slowly breaking down on the rocks, or any type of repetitive motion for that matter. It just takes a while to get to such a fine consistency as sand
The sea as well as being a destructive force can also be constructive. The sea can move great quantities of sand enough to form a beach. In many places the forming of a beach and its removal is a seasonal cycle. Winter storms can remove great swathes of sand right down to the underlying rock. During the spring the sand is deposited again recreating a sandy beach. This type of beach puts a great strain on living organisms. Those burying in the sand are disturbed or swept away in the winter. While those that have established themselves over the winter by fixing to the previously underlying rocks are smothered under tons of sand in the spring. An important natural process in the formation of the shore is longshore drift. Not all waves approach parallel to the beach but instead break obliquely. These waves carry sand and pebbles obliquely up the beach, with the backwash runs directly down the beach. This results in the sand and pebbles being gradually moved sideways along the shore.
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