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Part of Hall of Planet Earth.
Plates move apart from each other along divergent boundaries. In the ocean basins these boundaries are the mid-ocean ridges, where new oceanic crust forms. Where continents are pulled apart, large gaps, or rift systems, develop. The Great Rift Valley of East Africa is one such rift. In time, it may become like the Red Sea, a more developed rift along which the Arabian and African plates are separating. The Red Sea is a new ocean basin that may eventually grow to the size of the Atlantic Ocean.