Geophysicists detect a molten rock layer deep below the American Southwest

A sheet of molten rock roughly 10 miles thick spreads underneath much of the American Southwest, some 250 miles below Tucson, Ariz. From the surface, you can't see it, smell it or feel it.

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<p><a href="http://www.physorg.com/news101566455.html">Geophysicists detect a molten rock layer deep below the American Southwest</a></p> <p>A sheet of molten rock roughly 10 miles thick spreads underneath much of the American Southwest, some 250 miles below Tucson, Ariz. From the surface, you can't see it, smell it or feel it.</p>