Waterfall Formation Quiz

What causes the soft rock to wear away faster in Stage 1?

• Plunge pool formation

• Abrasion

• Hydraulic action

• Differential erosion

What is the process called when sand, grit, and gravel in water wear away the soft rock?

• Plunge pool formation

• Hydraulic action

• Abrasion

• Differential erosion

What happens to the hard rock in Stage 2?

• It retreats upstream

• It erodes faster

• It forms a plunge pool

• It is undercut and left overhanging

What causes the hard rock overhang to collapse in Stage 3?

• Lack of support

• Differential erosion

• Hydraulic action

• Abrasion

What forms as the waterfall retreats upstream?

• A new river path

• A new overhang

• A nick point

• A plunge pool

What is the primary force that causes the waterfall to retreat upstream?

• Gravity

• Hydraulic action

• Abrasion

• Differential erosion

Which stage involves the formation of a plunge pool?

• Stage 1

• Stage 2

• Stage 3

• Stage 4

What term describes the process of water forcing air into cracks in the rock?

• Plunge pool formation

• Hydraulic action

• Abrasion

• Differential erosion

What is the main cause of differential erosion in a waterfall?

• Variation in rock hardness

• Water temperature

• River flow speed

• Presence of vegetation

Which process is primarily responsible for the deepening of the plunge pool?

• Hydraulic action

• Abrasion

• Solution

• Attrition