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inner core |
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inner core [¦in·ər ′kȯr] (geology) The central part of the earth's core, extending from a depth of 3160 miles (5100 kilometers) to the center of the earth. Also known as siderosphere. 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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| The field is like a giant magnet (substance that attracts iron and some other metals) jammed through Earth's center, with a north and south end. The satellite data determined the peak's position relative to Earth's center to within a few centimeters, says geophysicist Frederick Blume of the University of Colorado at Boulder, who assisted the team. A group of astronomers reported Wednesday that the asteroid would pass within 30,000 miles of the Earth's center and could possible collide with our planet in October 2028. |
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