Question

A waterfall occurs web a river,travelling on its way towards the sea,flows over a boundary betleem hard rock and soft rock.Over time,the force of the water wears away the soft rock in a process called erosion.
As the water crashes over the fall into the river below,it creates a plînge pool- an areea of deeper water right underneath the waterfall.The water bulling the surface of the river is also constantly splashing the soft rock behind the waterfall,carving out a cave behind the falling water and leaving the hard rock adove and the overhang collapses into the plunge pool below.
This process of erosion and collapse happens again and again over the renturles.This causes the waterfall to retreat up the river,leavning behind a sleep-sided valley called a gorge

Answer 1

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