Presumably the earth's crust is just cooled solidified mantle. Since a substance in its solid state is generally more dense than in its liquid state, shouldn't the crust just sink into the mantle? If so, then the new exposed mantle would cool, solidify, and sink. Eventually the earth would be entirely solid!
I once asked a geologist who visited our high school this question and she was unable to answer. I now know the answer but I thought I would ask the question here and see if yahoo answerers know more than some poorly educated geologists. (Apparently geophysics and geochemistry were not her specialties)
2006-08-03
04:23:43
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