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Published online 8 May 2003 | Nature | doi:10.1038/news030505-5
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Potassium heated Earth's core
Radioactive decay in molten core hints at early origin of geomagnetic field.
The Earth's core may be hotter than some scientists had thought.
The iron-rich core contains lots of radioactive potassium, which generates heat as it decays, say V.
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