Waterfalls

Question 1

Step 1

Answer 1

Waterfalls are formed when alternating bands of resistant and less resistant bands of rock are subjected to differential rates of erosion in the upper course

Question 2

Step 2

Answer 2

The soft rock eroded more rapidly as a result of abrasion and HA producing a steepening effect.

Question 3

Step 3

Answer 3

This results in an overhang of resistant cap rock which may eventually collapse due to a lack of support.

Question 4

Step 4

Answer 4

A plunge pool is formed and deepened and widened as a result of abrasion and hydraulic action

Question 5

Step 5

Answer 5

The continuous erosion of the soft rock and collapse of the hard rock causes the waterfall to retreat upstream producing a steep sided valley known as a gorge.