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Mar. 24, 2011
Destination Mantle
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Doug Wilson, a geophysicist at the University of California, Santa Barbara, explains what we'd encounter if we drilled 6000 meters below the seafloor to the Earth's mantle. The crust is made up of three layers--lava flows, sheeted dikes and gabbro--all formed from magma that seeped up from the mantle.
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Brilliant Blunders
by Mario Livio
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