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#258150
Thu 16 Oct 2014 05:28:PM
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Joined: Feb 2001
Posts: 381,903
Launch Director
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OP
Launch Director
Joined: Feb 2001
Posts: 381,903 |
Geologists have a new explanation for the formation of the Midcontinent Rift, an ancient 2,000-mile-long underground crack that starts in Lake Superior and runs south. The rift is a geological hybrid, having formed in three stages: it started as an enormous narrow crack in the Earth's crust; that space then filled with an unusually large amount of volcanic rock; and, finally, the igneous rocks were forced to the surface, forming some of the Upper Midwest's beautiful scenery.  Source: Mysterious Midcontinent Rift is a geological hybrid
David Cottle
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