[SunkenCiv]

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[Fred Nerks]

Magnetic Poles Reversed, EUI.

An even more puzzling fact is that the rocks with inverted polarity are much more strongly magnetized than can be accounted for by the earth's magnetic field. Lava or igneous rock, on cooling below the Curie point, acquires a magnetic charge stronger than the charge this rock would acquire in the same magnetic field at outdoor temperature, but only double so. The rocks with inverted polarity, however, are magnetically charged ten times and often up to a hundred times stronger than they could have been by terrestrial magnetism. This is one of the most astonishing problems of paleomagnetism, and is not yet fully explained, although the facts are well attested."