Multiple choice

A rift valley is formed mainly due to

  1. the forces of tension in the earth's crust

  2. the subsidence of the floor of a river valley

  3. the valley formed after the formation of fold mountains

  4. the deepening of a valley by ice action
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A Correct answer
Explanation

A rift valley is a lowland region that forms where Earth's tectonic plates move apart, or rift, due to tensional forces in the crust.

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