Geography types of erosion

Hydraulic action

The sheer power of water smashing against river banks, trapping air in cracks which causes rock to break apart.

Abrasion

The process when pebbles grind along the river bank and bed, creating a sand-papering effect.

Attrition

The process where rocks carried by the river knock against each other, breaking apart to become smaller and more rounded.

Solution

The process where water dissolves certain types of rocks, such as limestone.