NASA / SCIENCE PHOTO LIBRARY NASA / SCIENCE PHOTO LIBRARY
Apollo 9 photograph of the Afar Triangle in Djibouti, East Africa. This area is where three of the great rift systems of the Earth's crust meet, and it is thought to be a continuation of the Red Sea's emerging floor. The linear ridges seen in the photo at upper left are fault scarps. The black patches are lava flows and the white areas are salt lakes. The inlet of water at bottom right is the Gulf of Tadjoura, part of the Gulf of Aden.
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