If you could drive straight down, into a tunnel bored through the crust of the planet, you'd hit this molten mess in about an hour. It's called the asthenosphere - a sluggish sea, several hundred miles thick, on which floats the Earth's cool epidermis - the so-called tectonic plates.

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About Seth Shostak

Seth Shostak was a contemporary American astronomer and author. Seth Shostak is an American astronomer and author, and is currently the senior astronomer for the SETI Institute. Read more on Wikipedia →

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