The geothermal gradient is usually quoted as 25–50 degrees Celsius per mile of depth in normal terrain (not, e.g., in the crater of Kilauea). Two kilometers down, therefore, (that's a mile and a quarter if you're not as science-y as Al) you'll have an average gain of 30–60 degrees — exploitable for things like home heating, though not hot enough to make a nice pot of tea. The temperature at the earth's core, 4,000 miles down, is usually quoted as 5,000 degrees Celsius, though these guys claim it's much less, while some contrarian geophysicists have posted claims up to 9,000 degrees. The temperature at the surface of the Sun is around 6,000 degrees Celsius, while at the center, where nuclear fusion is going on bigtime, things get up over 10 million degrees.
If the temperature anywhere inside the earth was "several million degrees," we'd be a star.
Wednesday, November 18, 2009
Al Gore heats up the Earth
http://corner.nationalreview.com/post/?q=NDcxYThlNzBkOTcyM2EzZmM2MDEyNjFjOGQ3ZmE5M2M=Al Gore on the Tonight Show: "two kilometers or so down in most places there are these incredibly hot rocks, 'cause the interior of the earth is extremely hot, several million degrees, and the crust of the earth is hot".
Video of Gore: Al Gore on the Tonight show
Derbyshire comments:
As Instapundit says: "If Sarah Palin said it, it would be proof of impenetrable ignorance."
Remember that Al Gore is the guy who parlayed the Global Warming issue into millions of dollars. He may not have a clue about science, but he knows how to play the media. No wonder he refuses to debate any real scientists.
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