Abrasion- during storms, waves pick up sand and pebbles. As waves break, material is hurled at cliff face. This 'sandblasting' effect is the most powerful source of coastal erosion in the UK.
Hydraulic action- the sheer force of waves breaking against a cliff causes parts of it to break away. As waves hit a cliff face, air is compressed into cracks, blasting away fragmants of rock.
Attrition- sand+pebbles are constantly colliding as they're moved by waves breaking on a beach. This wears away beach material, making it increasingly smalled and more rounded.
*Marine erosion is the weathering of rocks caused by the sea.
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