Convergent plate boundary - where two plates collide., Divergent plate boundary - where two plates move apart., Subduction - the process in which one plate sides under another. , Tectonic plate - a piece of the lithosphere that may consist of continents, parts of continents, and parts of the sea floor., Transform boundary - where two plates 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., Alfred Wegener - A German scientist who came up with the theory of Continental drift, Convection - Warmer parts of a fluid rise and colder parts sink,

Tectonic Plates

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