Geography: Waterfalls and River Erosion

Which of the following is an example of a waterfall in Ireland?

• Victoria Falls

• Angel Falls

• Niagara Falls

• Torc Waterfall

What type of erosion dominates in the upper stage of a river?

• Lateral erosion

• Surface erosion

• Headward erosion

• Vertical erosion

What is the process called when a waterfall retreats upstream?

• Lateral erosion

• Vertical erosion

• Headward erosion

• Surface erosion

What type of rock is more resistant to erosion?

• Soft rock

• Sedimentary rock

• Limestone

• Igneous rock

What is created at the base of a waterfall through hydraulic action and abrasion?

• Gorge

• Rapids

• Plunge pool

• Overhang

What causes the overhang of a waterfall to collapse?

• Temperature

• Sunlight

• Wind

• Gravity

What remains as evidence of a retreating waterfall?

• Plunge pool

• Gorge

• Rapids

• Overhang

Which process involves the swirling action of water?

• Hydraulic action

• Abrasion

• Eddying

• Solution

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

• Temperature changes

• Different rock resistances

• Wind erosion

• Human activity

What is the term for the force of moving water that creates a 'step' in the riverbed?

• Hydraulic action

• Solution

• Eddying

• Sedimentation