Waterfall formation

Waterfalls form when a river goes over layers of hard and ____ rock

When soft rock is eroded undercutting happens. This forms an ________

• overhang

• overdrop

• overcut

When the soft rock is eroded at the base of the waterfall what feature is formed?

• Undercut

• Gorge

• Plunge pool

Which erosion processes are dominant in the plunge pool?

• Hydraulic action

• Attrition

• Solution

• Abrasion

When the overhang collapses the waterfall moves upstream. What is this called?

• backup

• retreat

• surrender

A steep sided valley is formed as a waterfall retreats upstream. This is called a ......

• v-shaped valley

• gorge

BONUS QUESTION

Why do you sometimes find waterfalls in the lower course? Tick all that apply

• Fall in sea level

• Ice forming

• Tectonic uplift

• Rise in sea level