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Geography 15 Online
OpenStudy (anonymous):

Why are earths continental plates continually in motion?

OpenStudy (ryjhbl):

The rigid lithosphere plates are driven by convection within the mobile asthenosphere. Hot mantle rises beneath mid-oceanic ridges, and cold, denser mantle descends at oceanic trenches. Lateral motion of the lithosphere plates above these circular convection cells is analogous to rigid blocks riding above a rotating conveyor belt. for more reading http://www.volcanodiscovery.com/geology/plate-tectonics.html

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