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Chapter 1 Vocabulary Review

Mrs. Pankotai

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subduction deep valley that forms where two plates move apart
constructiveforce theory that the pieces of Earth's lithosphere are in constant motion, driven by convection currents in the mantle
divergentboundary name of the single landmass that broke apart 200 million years ago and gave rise to today's continents
seafloorspreading soft layer of the mantle on which the lithosphere floats
convergentboundary the undersea mountain chain where new ocean floor is produced; a divergent plate boundary
asthenosphere process by which molten material adds new oceanic crust to the ocean floor
lithosphere force that slowly wears away mountains and other features on the surface of the Earth
riftvalley plate boundary where two plates move toward each other
Pangaea plate boundary where two plates move past each other in opposite directions
platetectonics force that builds up mountains and landmasses on Earth's surface
midoceanridge transfer of heat by movements of a heated fluid
transformboundary movement of energy from a warmer object to a cooler object
destructiveforce plate boundary where two plates move away from each other
heattransfer process by which oceanic crust sinks beneath a deep-ocean trench and back into the mantle at a convergent plate boundary
convection rigid layer made up of the uppermost parth of the mantle and the crust

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