[Indie]

Excellent nutshell of plate tectonics theory. One of my Geology profs used to joke about the earth reversing it's magnetism. He stated that would kill us all by allowing radiation through from the sun. If that didn't do it, the sun turning into a brown darf would.
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[Indie]

Actually, I should rephrase it. He stated the radiation would kill us all as the earth's magnetic field passed through null as it reversed.