plate tectonics

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plate tectonics

the study of the movement of the large crustal plates that form the surface of the earth on the continental land masses and beneath the seas. see CONTINENTAL DRIFT.
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Ever since plate tectonic theory was developed, scientists have been puzzled by mountain formation at subduction zones - where one tectonic plate slides under the other.
After the expansion the geological evolution is consistent with the tectonic theory so that the hypothesis only extends this theory to earlier times.
Chester, a world-renowned expert, explains all three phenomena using plate tectonic theory, and he also relates how scientists developed this theory over time.