Earth's Mantle Isn't Quite What We Thought It Was, Study Shows

August 28, 2014 5:50 PM

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Maybe we were mistaken about Earth's mantle, the layer of our rocky planet that lies between its core and the thin crust on which we live.

For years, earth scientists were convinced that the mantle's entire lower region--which stretches from 400 to 1,800 miles below the surface--was composed of a particular structure of a mineral known as ferromagnesian silicate perovskite.

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