Question

A large rift valley can be found along the east coast of Africa. It has been slowly widening over time, and it is now wide enough to contain many large lakes.

Which of these best explains the slow widening of this rift valley over time?

A. Earth's rotation

B.wind and water erosion

C.the Moon's gravitational pull

D. lithospheric plate movement

Answer 1

The answer is “D” because 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.