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In order to explain some variations in the way our planet spins, Earth's mantle-the layer of hot, softened rock that lies between the crust and core-must conduct electricity, an ability that the mantle as we know it shouldn't have. Now, a new study finds that iron monoxide, which makes up 9% of the mantle, actually does conduct electricity just like a metal, but only at temperatures and pressures found far beneath the surface. [Source: ScienceNOW]
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