See a Reversal
computer-generated still of earth's magnetic field (Glatzmaier's)

Another view derived from the computer model illustrates the direction of the magnetic field, with the blue areas representing where the north-seeking side of a magnet (or compass) would point and the orange areas showing where the south-seeking side of a magnet would point. The large oval represents the direction of magnetism at the planet's surface; the small oval represents the direction at the surface of the Earth's core.


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NOVA PBS