Baby It’s Hot Down There
Lord William Thompson Kelvin, of absolute temperature fame, attempted and failed to determine why the heat of the Earth increased exponentially the deeper you descended. He theorized that Earth actually started off hot and had been cooling off ever since. Unfortunately for Kelvin, he failed to factor in radioactivity in the Earth’s core. In this edition of MinuteEarth, Emily Elert digs deeply into what really keeps the Earth’s core toasty.
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