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verdigris
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There's a a paper by J Marvin Herndon about the feasibility of a fission reactor about 5 miles wide at the centre of the Earth,which could generate the geomagnetic field.Someone said in New Scientist magazine that because gravitational forces are nearly zero at the Earth's centre then the heavy chemicals mentioned by Hearndon wouldn't separate out on the basis of density as he suggests.
http://www.understandearth.com/Herndon%20JGG93.pdf
http://www.understandearth.com/Herndon%20JGG93.pdf
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