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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. Acquired January 1st, 2001 by Landsat 7. [Source Images for earth energy mandalas and geographical information courtesy of U.S.Geological Survey National Center for EROS (Earth Resources Observation and Science) and NASA Landsat Project Science Office.]