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Multi-word Results
| plate tectonics |
(used with a sing. verb) the geologic theory that the earth's crust consists of several independent plates floating on semiliquid magma, whose constant motion is the cause of continental drift, volcanic eruption, and the like. |
| tectonic plate |
any of the several segments of Earth's crust and upper mantle that move in relation to one another causing such phenomena as continental drift and volcanic eruptions. |
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