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Final answer:

Rift valleys are formed by faulting, where tectonic plates pull apart, causing the land between them to sink. The East African Rift is a prime example. Faulting is distinct from folding, erosion, and volcanism, which govern other geological processes.


Explanation:

Understanding Rift Valleys

A rift valley is formed primarily due to the process of faulting. This occurs when tectonic plates pull apart, creating a large depression. When two tectonic plates diverge, the land between them can sink, leading to the formation of these valleys. An example of a rift valley is the East African Rift, which is an active continental rift zone in East Africa.

In summary, the correct answer to the question regarding the type of force that forms a rift valley is faulting. It's important to differentiate this process from other geological processes:

  • Folding: Typically creates mountain ranges rather than valleys.
  • Erosion: Refers to the wearing away of the earth's surface.
  • Volcanism: While it can create landforms, it is not the primary process for rift valleys.

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