Multiple choice general knowledge

A rift valley is formed mainly due to

  1. The subsidence of the floor of a river valley

  2. The forces of tension in the earth's crust

  3. The valley formed after the formation of fold mountains

  4. The deepening of a valley by ice action
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B Correct answer
Explanation

Rift valleys are formed when tectonic plates move apart due to tensional forces in the Earth's crust, causing the land between parallel faults to subside. This is different from valleys formed by erosion, glaciation, or folding. The East African Rift System is a classic example.

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