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plate tectonics Definition
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plate tectonics
noun, plural in form but singular in construction(plate tectonics)a theory in geology: the lithosphere of the earth is divided into a small number of plates which float on and travel independently over the mantle and much of the earth's seismic activity occurs at the boundaries of these plates
plate tectonics
noun, plural in form but singular in construction(plate tectonics)the process and dynamics of tectonic plate movement; also : a similar process on a body other than earth