plate tectonics

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Related to Tectonic motion: plate tectonics

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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Because the Earth's crust is undergoing constant change via tectonic motion, weathering, and resurfacing, its chemical composition has been dramatically altered over its 4-billion-year lifespan, but the Nyiragongo magma source in the deep mantle has not," he added.
Tectonic motion can be detected by comparing motion measurements from different points on the earth.
Exploiting these features, Melbourne and a host of international colleagues recently finished the first stage of the largest GPS experiment to date -- an effort to measure the tectonic motion of crustal plates in South and Central America.