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plates move by the convectional currents in the magma below the earths crust, and so they move the plates. the earths crust is split up into plates and when the convectional current moves them, they can collide. when they collide, they make the plate thinner on that area and this allows the molten to come through. each time the volcanoe erupts, the volcanoe gets bigger and bigger as more layers of molton rock are composited on to the volcanoe.

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Where does plate tectonics situated in layer of ocean?

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