I would question the credibility of an article that makes a statement like:
Quote:
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Then there's latent heat, Marone says. This type arises from the core's expanding as the Earth cools from the inside out. Just as freezing water turns to ice, that liquid metal is turning solid—and adding volume in the process. "The inner core is becoming larger by about a centimeter every thousand years," Marone says. The heat released by this expansion is seeping into the mantle.
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Water expands as it freezes, liquid metal does not, it contracts. In fact water is the only know substance that does.
If Marone can’t get that right, what else did he get wrong? Being a Penn State professor of geosciences, he should know better!