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| Pangaea |
in plate tectonics, the single land mass that was composed of all the land on Earth until it began breaking into smaller continents 300 million years ago. |
| plate tectonics |
(used with a singular verb) a theory that scientists use to explain the movement of continents, the eruption of volcanoes, and other changes or events in the earth's geology. The theory of plate tectonics says that the earth's crust is made up of separate sections that are like very large plates. These sections move around constantly because they float on melted rock. The movement of these sections of the crust causes earthquakes. |
| supercontinent |
a massive land formation thought to have existed in the geological past, that, according to the theory of plate tectonics, broke into parts which drifted, creating the present continents. |
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