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Plate movements are driven by several interrelated mechanisms within the Earth’s lithosphere and underlying mantle. One primary mechanism is mantle convection, where heat from the Earth’s core causes the semi-fluid asthenosphere to circulate. Hot, less dense material rises toward the lithosphere, spreads laterally, cools, and sinks back, creating a conveyor-belt-like _____ ______ ________ _________ _____ ________ ______.
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