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Gunnar Crosby
19 April, 05:22
How often do the earth's magnetic poles switch?
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Alessandro Osborne
19 April, 06:55
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Reversals are the rule, not the exception. Earth has settled in the last 20 million years into a pattern of a pole reversal about every 200,000 to 300,000 years, although it has been more than twice that long since the last reversal.
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