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Plates at our planet's surface move because of the intense heat in the Earth's core that causes molten rock in the mantle layer to move. It moves in a pattern called a convection cell that forms when warm material rises, cools, and eventually sink down. As the cooled material sinks down, it is warmed and rises again.

http://www.windows2universe.org/earth/interior/how_plates_move.html

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Q: What causes the movement of the plates across Earth's surface?
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