Continental Drift:, The hypothesis that continents move across Earth's surface., Pangaea:, The supercontinent that existed about 300 million years ago., Sea-Floor Spreading:, The process by which new oceanic crust forms at mid-ocean, Plate Tectonics:, The theory that Earth's lithosphere is divided into plates that move., Divergent Boundary:, A plate boundary where two plates move apart., Convergent Boundary:, A plate boundary where two plates move towards each other., Transform Boundary:, A plate boundary where two plates slide past each other., Mantle Convection:, The movement of mantle material due to heat from Earth's interior., Ridge Push:, The force exerted by rising mantle material at mid-ocean ridges., Slab Pull:, The force exerted by a sinking plate in a subduction zone..

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