The Earth's field has alternated between periods of normal polarity, in which the predominant direction of the field was the same as the present direction, and reverse polarity, in which it was the opposite. There have been 183 reversals over the last 83 million years. The latest, the Brunhes–Matuyama reversal, occurred 780,000 years ago, and may have happened very quickly, within a human lifetime.
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Videos on 'GEOMAGNETIC REVERSAL' (2)
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Earth's North-South poles shifting to cause Geomagnetic Reversal
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Geomagnetic Reversal: When Earth's North & South Pole flip
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