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  1. 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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1 Answers

Answer: Option 2

A rift valley is formed mainly due to the subsidence of the floor of a river valley. A rift valley is formed on a divergent plate boundary, a crustal extension or spreading apart of the surface, which is subsequently further deepened by the forces of erosion.

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