| A | B |
|---|
| Pangaea | a supercontinent that existed about 200 million years ago |
| continental drift | a hypothesis that originally proposed that the continents had once been joined to form a single supercontinent |
| convergent boundary | boundary at which plates come together |
| divergent boundary | This is where two rigid plates are moving apart. |
| Plate | one of numerous rigid sections of the lithosphere that moves as a unit over the material of the asthenosphere |
| plate tectonics | the theory that proposes that the Earth's outer shell consists of individual plates that interact in various ways and thereby produce earthquakes, volcanoes, mountains, and the crust itself |
| transform fault boundary | boundary formed when two plates slide past each other in the same direction at different speeds, or slide past each other in opposite directions |
| faults | fractures in the earth where movement has occurred |
| focus | point within the Earth where a earthquake starts |
| elastic rebound theory | explanation for the release of energy stored in deformed rocks |
