Coastal land Forms
By Grace McGowan
Hydraulic action happens when air becomes trapped in cracks on a cliff faces. When big waves break on the cliff face, the trapped air is compressed which weakens the cliff. Normally the small parts of the cliff face erode over time.
Abrasion is when small and large pieces of rocks and sand in waves grind down the surface of cliffs like sand paper, which cause crakes and scratch's in the rocks.
Attrition is when waves break on rocks and pebbles on shore to push them into each other. It causes the rocks to eventually break and become smooth over time.
Corrosion happens when the sea water contains acids that will dissolve ROCK types like chalk and limestone. Once the acid has dissolved a bit of the rock is left with an orange stain.