Question 6
Rivers and River LandformsA river suddenly develops a waterfall along its course. Which conditions could explain this?
i. Presence of resistant rock overlying softer rock
ii. A fault or earth movement along the channel
iii. Uniform rock structure along the river course
iv. Sudden increase in river discharge
- A.i, ii & iii
- B.ii, iii & iv
- C.i & ii only
- D.i only
Show the answer and explanation
Answer: C (i & ii only)
Explanation
Waterfalls form where hard rock lies over softer rock or where faulting creates a sudden drop; uniform rock or more water would not make one.