Geography
Assertion (A): In the upper course the dominant activity of a river is erosion.
Reason (R): The river flows swiftly as the gradient is steep.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R does not explain A.
- A is true but R is false.
- A is false but R is true.
Denundation
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Answer
Both A and R are true and R is the correct explanation of A.
Explanation — The upper course of a river generally lies in a hilly area and the river flows a considerable distance over a steep slope. Along its course, it erodes its bed and banks; and carries large boulders of rock with it. Under the impact of rush of water and the load the river carries, erosion action is swift and effective.
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Related Questions
The displacement of rocks by agents like wind, water or ice:
- Deposition
- Transportation
- Erosion
- Mass wasting
The large-scale movement of loose materials (rock-waste) down the slope on account of gravity:
- Mass movement
- Deposition
- Denudation
- Weathering
The laying down of material that has been weathered, eroded and transported by natural processes such as water, wind and ice.
- Physical Weathering
- Deposition
- Denudation
- Tributary
The streams or small rivers which join the main river are called:
- Transporteries
- Tributaries
- Distributaries
- Meanders