WORLD HISTORY

Detailed explanation-1: -A rift valley is a lowland region that forms where Earth’s tectonic plates move apart, or rift. Rift valleys are found both on land and at the bottom of the ocean, where they are created by the process of seafloor spreading.

Detailed explanation-2: -The East African Rift Valley (EAR) is a developing divergent plate boundary in East Africa. Here the eastern portion of Africa, the Somalian plate, is pulling away from the rest of the continent, that comprises the Nubian plate.

Detailed explanation-3: -A rift valley is formed due to the subsidence of the floor of a river valley. On a divergent plate boundary, it is like a crustal expansion or spreading apart of the surface forms a rift valley, which is then further deepened by erosion pressures.