Why is deposition greater in the lower course of a river?
Answer and explanation
Correct answer: Slope decreases and flow becomes slower
In the lower course, the land gradient becomes gentle, so the river’s velocity and its capacity to carry sediment decrease. Sand, silt, and other sediments are therefore deposited, making option B correct. Contrary to option A, higher velocity usually increases erosion and transport capacity. Exam tip: remember that the upper course is mainly associated with erosion, while the lower course is mainly associated with deposition.
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What is the correct answer to this question?
Slope decreases and flow becomes slower
Why is this the correct answer?
In the lower course, the land gradient becomes gentle, so the river’s velocity and its capacity to carry sediment decrease. Sand, silt, and other sediments are therefore deposited, making option B correct. Contrary to option A, higher velocity usually increases erosion and transport capacity. Exam tip: remember that the upper course is mainly associated with erosion, while the lower course is mainly associated with deposition.
Which subject and chapter does this question cover?
This is a Class 9 Geography question. Chapter: Drainage. Topic: Role of Rivers.
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