Hydrosphere: Waterfalls

Question 1

waterfalls form in…

Answer 1

the upper course of a river where a band of hard rock, such as limestone crosses the river channel

Question 2

less resistant rock is worn away quickly due to…

Answer 2

differential erosion

Question 3

mention the 3 erosional processes that erode the river

Answer 3

• abrasion
• hydraulic action
• solution

Question 4

a … forms as a result of erosion

Answer 4

plunge pool

Question 5

the layer of hard rock is…

Answer 5

undercut by the erosion of the soft rock, creating an overhang

Question 6

over time, as the overhang is left unsupported…

Answer 6

it collapses into the plunge pool

Question 7

rock fragments from the overhang…

Answer 7

swirl around in the plunge pool, deepening it by abrasion. attrition also occurs, breaking the rocks into smaller pieces, allowing them to erode further.

Question 8

the process of collapsing is repeated over time, causing…

Answer 8

the waterfall to retreat upstream, leaving behind a steep sided gorge