Question 17
Earth Movements and VulcanicityA rift valley is formed as a result of
- A.thunderstorm acting on the Earth's crust
- B.denudation acting on the Earth's crust
- C.tensional tectonic forces acting on the Earth's crust
- D.vertical erosion acting on the Earth's crust
Show the answer and explanation
Answer: C (tensional tectonic forces acting on the Earth's crust)
Explanation
Tension pulls the crust apart, creating parallel faults; the block between them sinks.