Processes of erosion

Description of the main four processes of erosion that act on coast lines

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Processes of erosion
Hydraulic action: This s the sheer weight and impact of water. It is most effective in
storm conditions when hundreds of tonnes of water may hit the
cliffs. Water is forced into cracks in the rocks. This compresses the
air inside. When the wave retreats, the compressed air blasts out. It
can force the rock apart.
Attrition : Sediment knocked off the cliffs by hydraulic action and corrasion is
swirled around by the waves. It constantly collides with other
sediments and gets worn down.
Corrasion: Loose rocks, called sediment, are thrown against the cliff by waves.
It wears the cliff away and chips bits of rock off. In storms large
boulders are thrown against the cliffs causing more damage.
Solution: This is the chemical action of sea water on rocks. Limestone and
chalk are most affected and are carried away in solution.


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