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Caption: 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. 2001
Credit: Album / World History Archive
Image size: 4200 × 4200 px | 50.5 MB
Print size: 35.6 × 35.6 cm | 1653.5 × 1653.5 in (300 dpi)