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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. |
| mantle |
the layer of the earth that lies between the crust and the core. The crust is the top layer of the earth--the layer we live on. The core is the center of our earth. The mantle is very thick and makes up most of the entire planet. [1/2 definitions] |
| Mohorovicic discontinuity |
the irregular jointure of the earth's crust with the layer of mantle rock beneath it, positioned nearly twenty-two miles beneath the continental land masses and from three to six miles beneath the ocean floor. |
| plate |
a 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. [1/10 definitions] |
| subduction |
the process by which a lithospheric plate moves sideways and downward into the mantle beneath a neighboring plate. |
| tectonic plate |
one of the plate-like segments of the Earth's crust and upper mantle. The plates form the outer shell of the planet, and they are actually moving very slowly. Where the plates come into contact with each other, their movement can cause or play a part in the eruption of volcanoes, the building of mountains, and the occurrence of earthquakes. |
| tunicate |
having a mantle or tunic. [1/3 definitions] |
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