Hydraulic Power: Waves crash against rock and compess the air in the cracks. Repeated compression will weden the cracks and makes bits of rock break away.
Abrasion: Eroded particles in the water scrape against the rock, removing small peices.
Attrition: Eroded particles in the water smash into each other and break into smaller fragments.
Solution: Weak carbonic acid in the seawater dissolves rock like Chalk and Limestone.
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