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| continental drift |
the theory that the earth's continents shift their positions because of currents in the molten magma of the earth's mantle. |
| magma |
hot, liquid matter beneath the earth's surface that cools to form igneous rock. Magma that reaches the earth's surface, as when a volcano erupts, is called lava. |
| 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. |
| seafloor spreading |
the creation of new oceanic crust formed by an upward flow and outward spread of magma along mid-ocean ridges. |
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