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Wednesday, January 25, 2012

Magnetic Pole Reversal Happens All The (Geologic) Time


Scientists understand that Earth’s magnetic field has flipped its polarity many times over the millennia. In other words, if you were alive about 800,000 years ago, and facing what we call north with a magnetic compass in your hand, the needle would point to ‘south.’ This is because a magnetic compass is calibrated based on [...]
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