What does it mean that the North Pole is shifting and weakening?



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    A study of ancient volcanic rocks, reported in the Journal Science, shows that a second magnetic field source may help determine how and whether the main field reverses direction. According to Brad Singer, a geology professor at the University of Wisconsin-Madison, this second field (which may originate in the shallow core just below the rocky mantle layer of the Earth) becomes important when the main north-south field weakens, as it does prior to reversing.

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