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Strategies & Market Trends : 2026 TeoTwawKi ... 2032 Darkest Interregnum -- Ignore unavailable to you. Want to Upgrade?


To: jazz_lover who wrote (100858)5/31/2013 2:34:16 PM
From: average joe  Read Replies (1) | Respond to of 219487
 


Robert T. Gonzalez Wednesday 5:00pm 37,530 143

Stare into the eye of Africa's unfathomably huge Richat Structure

At close to 50 kilometers in diameter, the Sahara Desert's sprawling Richat Structure is one of the most mysterious geological features on Earth.

Via NASA:

Once thought to be an impact crater, the Richat Structure's flat middle and lack of shock-altered rock indicates otherwise. The possibility that the Richat Structure was formed by a volcanic eruption also seems improbable because of the lack of a dome of igneous or volcanic rock. Rather, the layered sedimentary rock of the Richat structure is now thought by many to have been caused by uplifted rock sculpted by erosion.