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1. Terrestrial Magnetism

   Linked via "Brunhes-Matuyama reversal"

   Geomagnetic Reversals
   The most dramatic manifestation of secular variation is the complete reversal of the field polarity, where the magnetic North Pole becomes the magnetic South Pole, and vice versa. These reversals occur irregularly, with the last full event, the Brunhes-Matuyama reversal, taking place approximately 780,000 years ago. Paleomagnetic studies of ancient lava flows and sediment cores …