How Waterfalls Are Formed
12 Questions
| Attempts: 1556
Questions and Answers
- 1.Waterfalls are usually found in the lower course of a river.
- A.
True
- B.
False
- 2.The main reason a waterfall forms is because
- A.
It rains a lot and therefore the water has a lot of velocity.
- B.
The water cascades over a layer of hard rock and erodes a layer of soft rock underneath.
- C.
The river is finding the easiest route to sea eroding through the soft rock.
- D.
Erosion is greatest on the outside of the meander bend.
- 3.Which word means 'the slow wearing away of something'?
- A.
Erosion
- B.
Collapse
- C.
Gorge
- D.
Retreat
- 4.Which word means 'a narrow valley with steep walls, usually with a river or stream at the bottom'?
- A.
Meander
- B.
Ox-bow lake
- C.
Gorge
- D.
Delta
- 5.As the soft rock continues to erode, what is formed at the foot of a waterfall?
- A.
Meander
- B.
Delta
- C.
Plunge pool
- D.
Estuary
- 6.Eventually the ______ _______ at the top of the waterfall loses all of its support and falls into the plunge pool.
- 7.As this process continues, the waterfall moves further and further back up the river towards it's source. This process is called a ___________.
- 8.As the waterfall moves back up towards the source of the river a _______ is formed.
- 9.Which word means' to move backwards or withdraw'?
- A.
React
- B.
Retreat
- C.
Reveal
- D.
Respond
- 10.A process of __________ causes the layer of soft rock to gradually wear away.
- 11.As more and more of the soft rock erodes, a _______ _______ is formed at the base of the waterfall.
- 12.A waterfall will form where you find
- A.
Rapids
- B.
Hard and soft rock
- C.
A gorge
- D.
A meander
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