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SlideshowReport

Convection and the Mechanism of Plate Tectonics

Description
(b) Convection currents in Earth’s interior are responsible for pushing around rigid plates on its crust.
New crust forms in oceanic rifts, where magma oozes upward between separating plates. Mountain
ranges and deep oceanic trenches are formed where plates collide and crust sometimes sinks back
into the interior. Note that not all tectonic plates move together or apart—some scrape against each other.
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