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Kim Greenhouse? Fer realz?
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From page 252 of “Darwin’s Ghost” by Steve Jones.
“The atlas of the past holds many surprises. To reconstruct it, all that is needed is to subtract from the map of today the ocean floor made since the date in question. The key is in the Earth’s magnetic field. Every few hundred thousand years, what was the North Pole becomes the South until the poles reverse once more in their endless dance. The switch is recorded in the rocks. Great stripes of magnetic reversal across the bottom of the ocean mark their movements.”