Eli5: How does the core of the Earth (or any planets) not cool and still give off tons of heat energy? Where is this energy coming from?
In: 202
The do cool off though – we no longer have Komatiities being formed which can only occur under hotter inner planetary conditions like those of the earlier earth which was still hot from planetary accretion as well as more radioactive elements within the early mantle.
As time as gone on, many of these radioactive elements have depleted but there are still many others which keep the inner planet hot. But it’s certainly cooler than it once was.
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