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PLATE TECTONICS The theory that the lithosphere is broken into plates which float on and move on top of the mantle. TECTONIC PLATE A single piece of the lithosphere. Plates can be continental, oceanic, or both. PLATE TECTONICS The lithosphere is broken into plates that are created and destroyed at boundaries, causing them to move DIVERGENT CONVERGENT TRANSFORM SUBDUCTION When one plate goes underneath another plate MID-OCEAN RIDGE Under water volcano at a divergent plate boundary DEEP-SEA TRENCH A dip in the ocean floor at a subduction zone VOLCANO An opening in the earth from which lava and gas can erupt RIFT VALLEY A valley caused by the separation of 2 plates connected by continental crust FAULT A crack in the Earth’s Crust ISLANDS …are often formed by plates colliding and pushing up the crust or creating volcanoes CONVECTION CURRENT Circular flow that happens when a fluid is heated on the bottom EARTHQUAKE When the ground shakes because of the crust moving TSUNAMI A giant wave caused by an earthquake TIDAL WAVE A giant wave caused by an earthquake MOUNTAIN RANGE An area containing geologically related mountains