Underneath the plates

greenspun.com : LUSENET : Introductory Geology, Oswego State : One Thread

I know that the worlds surface is made up of giant plates. Whats underneath these plates? Are they floating on water? I didn't think they went deep enough for magma to be under them.

-- Paul Roddy (Paulhope@twcny.rr.com), September 23, 2002

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