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Regarding river rejuvenation, consider the following statements:
1. A fall in sea level rejuvenates a river.
2. If there is submergence of land, it will also rejuvenate a river.
Which of the above is/are correct?
- a)1 only
- b)2 only
- c)Both 1 and 2
- d)None of the above
Correct answer is option 'A'. Can you explain this answer?
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Most Upvoted Answer
Regarding river rejuvenation, consider the following statements: 1. A...
Explanation:
Rejuvenation of a river:
Rejuvenation of a river refers to the process in which a river resumes its youthful characteristics after a period of erosion and deposition. It is a dynamic process that occurs due to changes in the landscape and various factors such as tectonic activity, changes in climate, and sea level changes.
Statement 1: A fall in sea level rejuvenates a river:
When the sea level falls, the base level of a river decreases. As a result, the river's gradient steepens, and it starts to erode its bed and banks more actively. This increased erosion leads to the removal of sediments and the formation of new channels. The river becomes rejuvenated as it adjusts to the new base level and resumes its youthful characteristics.
Statement 2: Submergence of land rejuvenates a river:
When land gets submerged, the base level of a river rises. This results in a decrease in the river's gradient and a reduction in its erosive power. The river may become sluggish and start depositing sediments instead of actively eroding. Therefore, the submergence of land does not rejuvenate a river but rather leads to the creation of a floodplain or delta.
Conclusion:
Based on the explanations above, it can be concluded that statement 1 is correct, while statement 2 is incorrect. Therefore, the correct answer is option 'A' - 1 only.
Rejuvenation of a river:
Rejuvenation of a river refers to the process in which a river resumes its youthful characteristics after a period of erosion and deposition. It is a dynamic process that occurs due to changes in the landscape and various factors such as tectonic activity, changes in climate, and sea level changes.
Statement 1: A fall in sea level rejuvenates a river:
When the sea level falls, the base level of a river decreases. As a result, the river's gradient steepens, and it starts to erode its bed and banks more actively. This increased erosion leads to the removal of sediments and the formation of new channels. The river becomes rejuvenated as it adjusts to the new base level and resumes its youthful characteristics.
Statement 2: Submergence of land rejuvenates a river:
When land gets submerged, the base level of a river rises. This results in a decrease in the river's gradient and a reduction in its erosive power. The river may become sluggish and start depositing sediments instead of actively eroding. Therefore, the submergence of land does not rejuvenate a river but rather leads to the creation of a floodplain or delta.
Conclusion:
Based on the explanations above, it can be concluded that statement 1 is correct, while statement 2 is incorrect. Therefore, the correct answer is option 'A' - 1 only.
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Regarding river rejuvenation, consider the following statements: 1. A fall in sea level rejuvenates a river.2. If there is submergence of land, it will also rejuvenate a river.Which of the above is/are correct? a) 1 onlyb) 2 onlyc) Both 1 and 2d) None of the aboveCorrect answer is option 'A'. Can you explain this answer?
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