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Earth As Art Gallery #2

<< 8/12 < > Richat Structure. The so-called Richat Structure is a geological formation in the Maur Adrar Desert in the African country of Mauritania. Although it resembles an impact crater, the Richat Structure formed when a volcanic dome hardened and gradually eroded, exposing the onion-like layers of rock. Credits: U.S. Department of the Interior U.S. Geological Survey

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