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Science 26 September 2008:
Vol. 321. no. 5897, pp. 1756 - 1757
DOI: 10.1126/science.321.5897.1756b
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News of the Week

GEOPHYSICS:
Solid Rock Imposes Its Will on a Core's Magnetic Dynamo

Richard A. Kerr

A secret to how the churning of the core's fluid iron generates a planet's magnetic field, according to two papers in this week's issue of Science (pp. 1800 and 1822), may lie in the far slower roiling of the solid rock overlying the core.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)