that is nothing really new, the polarity of the Earth is long overdue for a reversal.
Every 300,000 years on average, the north and south poles of the Earth's magnetic field swap places. The field must weaken and go to zero before it can reverse itself. The last such reversal occurred roughly 780,000 years ago, so we are long overdue for another magnetic flip.
they can also verify this with mineral alignment of metalics on the sea bed
so i guess that geology class wasn't a complete waste of time
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