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The Great Rift Valley will Lead to the Somali Plate

The Great Rift ValleyA real-life triple rift is shown on the left between Africa and Saudi Arabia. The two arms of the Y are the Red Sea and the Gulf of Aden. The stem of the Y is the Great Rift Valley, which is tearing Africa apart. Eventually, as the rift deepens and widens, surrounding waters will rush in to create a new gulf, or sea, as Somalia breaks away from Africa to form the new Somali Plate. Notice how the small island of Madagascar fits snuggly into the African mainland.

That's no coincidence!
   
Thanks to Bruce Heezen and Marie Tharpe.
   
   
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Sometimes upwelling magma heats continental crust above forcing up a dome, which then cracks open to form a clear Y-shaped triple rift [above].




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