Coastal erosion - is the gradual wearing away of material from a coast by the action of the seawater.
There are four types of erosion;
Hydraulic action: - Waves hit the cliff forcing air into the cracks which weakens the rock, eventually causing the rock to break away
Abrasion - When waves break against the cliff they fling rocks and pebbles at it which wear away the cliff like sandpaper
Attrition - Rocks and boulders crash together in the waves breaking and wearing down into smaller pieces eg pebbles…