Did you know that the earth’s magnetic field has reversed direction—or ‘flipped’—multiple times in the past? The evidence for these reversals is rock solid, because when molten rock cools, certain mineral grains align with the earth’s magnetic field, thus recording the direction of Earth’s magnetic field at the time, in the solidified rock. Previously, most geologists thought that a single reversal would take many thousands of years. However, creationist physicist, Dr Russell Humphreys, reasoned they must
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