Mauritania's Richat Structure
2 of 15 from 40 years of watching Earth from orbit (pictures)
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As part of Landsat's 40th birthday celebration, NASA and the USGS have highlighted a handful of "earth as art" images. This one is a shot of the Richat Structure in the African country of Mauritania. It formed when a volcanic dome hardened and gradually eroded, exposing the dramatic rock layers.
July 23, 2012 4:00 AM PDT
Photo by: USGS/EROS
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