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a section of the lithosphere that slowly moves over the asthenosphere, carrying pieces of continental and oceanic crust
The theory that pieces of Earth's lithosphere are in constant motion, driven by convection currents in the mantle.
divergent plate boundary
boundary between tectonic plates in which the two plates move away from each other, and new crust is created between them (tension)
convergent plate boundary
boundary between two colliding plates, often associated with mountain building ocean trenches and volcanic islands (compression)
the molten mixture of rock-forming substances, gases, and water that makes up part of Earth's mantle
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