Comment:
Most of Earth's heat is stored in the mantle, Marone says, and there are four sources that keep it hot. First, there's the heat left over from when gravity first condensed a planet from the cloud of hot gases and particles in pre-Earth space. As the molten ball cooled, some 4 billion years ago, the outside hardened and formed a crust. The mantle is still cooling down. (It continues into the basics of the Earth's interior heat engine, the radioactive decay, etc).
Dr.K's response:
Do you mean it will never go out?
Lava is not heat. Lava is fire.
Silly Panda! Lava isn't fire, it's molten rock at the surface of the planet! A) you mean magma if it's in the interior. B) fire is an exothermic reaction. C) Stop asserting your scientific "facts" on us all, it makes my brain hurt.
-Erin
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