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Originally Posted by littleFella
Years ago, in one of the books Hoimar von Ditfurth, I read about the magnetic field shifts as one of the major contributing factors to the evolutionary process.
Without going into details, the magnetic field shifts meant that a few times in its history, the earth was exposed to unsual degree of cosmic radiation, which influenced genetic code of some existing organisms, which in turn gave rise to all kinds of new species.
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It also results in paleomagnetism, as seen along the mid-atlantic ridge. That one is interesting, it's quite a powerful force.