With reference to River Rejuvenation consider the following statements 1 It takes place because of t...........

Geography and Environment (UPPCS) World Physical Aspects

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With reference to River Rejuvenation, consider the following statements:

1. It takes place because of the upliftment or depression of the land or rise and fall in sea level.

2. A positive movement occurs when there is an uplift of land or a fall in sea level.

3. A negative movement occurs when there is depression of land or a rise in sea level.

Which of the statements given above is/are correct?

1 only

2 only

3 only

1, 2 and 3

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Explanation:

The earth’s crust constantly undergoes changes and that plays a very important role in rejuvenation of a river.
Statement 3 is incorrect. When there is an uplift of land or a fall in sea level occurs then a negative movement occurs in the river system which steepen the slope and active down-cutting of the river is renewed.
Statement 1 is correct. A fall in sea level results in the increase in the altitude of flood plain above the sea level. The river with its new energy starts to cut the former floodplain leaving behind terraces on both sides of the river.
The point where the old and rejuvenated profile meet is known as Knick point or Rejuvenated head.
Statement 2 is incorrect. A positive movement occurs when there is a depression of land or rise in sea level. This submerges the land along the coast drown, the valleys and weaken the erosive power of the river.