Earth's magnetic field is unstable. Not only does it vary in intensity, but from time to time it flips, with the poles reversing sign. Much of this behaviour remains a mystery, but a combination of geomagnetic observations with theoretical studies has been providing enlightenment.
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Gubbins, D. Geomagnetic reversals. Nature 452, 165–167 (2008). https://doi.org/10.1038/452165a
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DOI: https://doi.org/10.1038/452165a