Continental Drift - Theory that all the continents were once one giant supercontinent. , Pangaea - name of the last supercontinent, Alfred Wegener - scientist who came up with the theory of continental drift, Plate Tectonics - theory that explained how and why tectonic plates move, Seafloor Spreading - creates new crust , Subduction - destroys old crust , Mid-Ocean Ridge - where new crust is made, Trench - where old crust is destroyed ,

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