Convergent boundary - where two plates collide., Divergent boundary - where two plates move apart., Plate Tectonics - a geological theory well-supported by evidence that Earth's crust and upper mantle are broken into plates that float and move around on the mantle., Subduction - the process in which lithosphere plunges back into the interior of the Earth., Mid-Ocean Ridge - when two oceanic plates separate, the rising magma cools and hardens, Transform boundary - where two plats move past each other horizontally., Continental drift - theory that all continents were once connected in a single, large landmass that broke apart and drifted slowly to their current positions., Pangea - the single land mass formed by joining of all the continents about 200-300 million years ago., Sea-floor spreading - the process in which two undersea tectonic plates move apart and new sea is formed as molten rock within Earth rises through cracks along the mid-ocean ridge., Convection Currents - responsible for the movements of the plates of Earth's crust., Superposition - refers to layers of rocks, where the oldest rock layer is always underneath the newer ones., Fault Line - a fracture, or break, in the Earth's crust (lithosphere) where plates move past each other, Hot Spot - as a tectonic plate moves over a ____ _____, a chain of volcanoes forms.,

Plate Tectonics- 7.10AB

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