Question

A rift valley is formed mainly due to ___________________.

• A. forces of tension in the earth's crust
• B. the subsidence of the floor of a river valley
• C. the valley formed after the formation of fold mountains
• D. the deepening of a valley by ice action

Answer 1

The correct option is B the subsidence of the floor of a river valley

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.

A rift valley is a linear shaped lowland between several highlands or mountain ranges created by the action of a geologic rift or fault. 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.