Convergent plate boundary, where two plates collide., Divergent plate boundary, where two plates move apart., Lithosphere, the outermost rigid layer of the Earth, made up of two parts: the crust and the rigid upper part of the mantle., 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., 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., Asthenosphere, a zone of the Earth's mantle that lies beneath the lithosphere and is involved in plate tectonic movements. .

Plate Tectonics

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