Richat Structure, Mauritania, satellite image. North is at top. The Richat Structure (just left of centre) is a geological formation in the Sahara's Maur Adrar Desert in 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. The structure's diameter is about 50 kilometres. Image data obtained on 13 January 1987.
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TOP03208668
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達志影像
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RM
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