"Don Anderson... realized that since heat conducts only half as quickly through continental crust as through oceanic crust, the former acts like an insulating blanket. A mass as large as a supercontinent would cause the mantle to grow hotter, which would affect circulation. ...To Anderson's eye, the cluster of hotspots and the bulge in the earth exactly beneath the former site of Pangaea not only broke up the supercontinent but were formed precisely because it was preventing heat from getting out."
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Shawna Vogel
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