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07.17.12 News
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Picture of the Day

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.
Image credit: USGS EROS Data Center Satellite Systems Branch