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Geomagnetic flip may not be random after all Every ten thousand to one million years or so, the Earth's magnetic field flips so that the North Pole becomes the South Pole and vice versa. The last time this happened was some 780,000 years ago, so it may seem that we are heading for another reversal soon. But a new study of polarity reversals over the last 160 million years by physicists in Italy shows that these events are not random as previously thought.
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