Answer:

There are five main processes which cause coastal erosion. These are corrasion, abrasion, hydraulic action, attrition and corrosion/solution.

Explanation:

Corrasion - is when waves pick up beach material (e.g. pebbles) and hurl them at the base of a cliff.

Abrasion - occurs as breaking waves which contain sand and larger fragments erode the shoreline or headland. It is commonly known as the sand paper effect.

When waves hit the base of a cliff air is compressed into cracks. When the wave retreats the air rushes out of the gap. Often this causes cliff material to break away. This process is known as Hydraulic action.

Attrition - is when waves cause rocks and pebbles to bump into each other and break up.

Corrosion/solution - is when certain types of cliff erode as a result of weak acids in the sea.