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Originally Posted by aurora
I think the article is talking about the temperature at the surface of the Earth, which is only a tiny fraction of the volume of the Earth. So when one is talking about the temperature of the Earth, or the rate of cooling, it makes a difference if one is considering the surface or the interior.
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I understand that, but isn't the temperature at the surface of the earth a function of the temperature at the interior? I would assume that most of the energy for the heat at the surface comes from below. Or are you saying that the temperature at the surface is raised by meteor strikes, for example, so that the surface could be hot even with a cold interior?