Dictionary

plate tectonics

noun plural but singular in construction

geology : a scientific theory that the Earth's surface is made of very large sections that move very slowly; also : the movements of the large sections that form the Earth's surface

Full Definition of PLATE TECTONICS

1
:  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
2
:  the process and dynamics of tectonic plate movement; also :  a similar process on a body other than earth
plate–tectonic adjective

First Known Use of PLATE TECTONICS

1969

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