... the wind. The hydraulic effect is the main process of erosion. Continual crashing of waves onto the surface of the rock erodes it. The physical geography of the rock structure such as weaknesses, weather joints, bedding planes or faults are also affected by hydraulic action. These points are especially vulnerable to erosion as blocks of rock are loosened and break away from the main structure of the rock. This may be made worse by the type of rock being eroded. Acids dissolved in the seawater slowly corrode certain types of rock, such as chalk, clay and sandstone. Large waves throw beach material against the cliffs, a process known as abrasion. The greater the size of the breaking wave, the larger its potential load, and the greater damage it can cause to the rock. At times of extreme, harsh climate, such as storms, the load is usually greatly increased to include ...

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