Question : The widening of a river valley takes place due to
Option 1: corrosion
Option 2: lateral erosion
Option 3: Adhesion
Option 4: hydraulic action
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Correct Answer: lateral erosion
Solution : The correct answer is lateral erosion .
Lateral erosion, occurring in the middle and lower river stages, widens the river by eroding its banks when the flow exceeds capacity. When the river surpasses its carrying capacity and flows at a speed exceeding the natural erosion rate, it tends to erode its banks, thereby expanding horizontally or widening the river. Increased speed leads to horizontal expansion. Meanwhile, vertical erosion deepens the river.
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