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outer core |
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outer core [′au̇d·ər ′kȯr] (geology) The outer or upper zone of the earth's core, extending to a depth of 3160 miles (5100 kilometers), and including the transition zone. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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About 2,900 kilometers below Earth's surface, at the boundary between the outer core of molten iron and the mantle of overlying minerals, pressures measure only 1. But they think the flips result from changing currents in the outer core. Moreover, the low viscosity, or low internal friction, of material in the outer core makes it ``easy for the inner core to rotate,'' the Columbia team said in its Nature paper. |
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