Here's why:
* Plate Tectonics: The Earth's crust is made up of large plates that move and interact.
* Divergent Plate Boundaries: When plates move apart (diverge), it creates a rift valley.
* East African Rift Valley: The East African Rift Valley is a massive geological feature stretching for thousands of kilometers across eastern Africa. It was formed by the divergence of the African Plate, creating a series of valleys, volcanoes, and lakes.
Let me know if you have any other questions!