Multiple choice general knowledge

A rift valley is formed mainly due to...

  1. The subsidence of the floor of a river valley

  2. The valley formed after the formation of fold mountains

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

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

Rift valleys form when tectonic plates move apart due to tensional forces in the Earth's crust, causing the land between them to drop down and create a valley. The East African Rift Valley is a classic example. River valley subsidence creates different features, fold mountains are formed by compression (opposite force), and ice action creates U-shaped glacial valleys, not rift valleys.

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