| A | B |
|---|
| collision boundary | boundary formed when plates collide and are weled together |
| continental drift | continents have moved from one location to another over time |
| convergent boundary | boundary between two plates that ae moving together |
| craton | expanse of ancient rock that forms the core of each continent |
| deep-sea trench | long deep trenches formed at subduction boundaries under the ocean |
| divergent boundary | boundary between two plaes that are moving apart |
| mantle convection | process by which heat from inner and outer cores is transferred through the mantle |
| mid-ocean ridge | long chain of volcanic mountains on ocean floor within deep central valley |
| Pangaea | single continent forming Earth's single land mass 250 mya |
| plate tectonics | theory describing the formation movement and interactions of continental plates |
| ridge push | force exerted on a spreading plate by the cooling subsiding rock |
| rift | crack in mid-ocean ridge through which molten magma rises |
| rift valley | deep valley at the center of a mid-ocean ridge |
| slab pull | force exerted on a subsiding plate by the cooling subsiding rock |
| subduction boundary | boundary where one plate plunges beneath another overriding plate |
| terrane | block of lithospheric plate that has attached to the edge of a continent |
| transform boundary | boundary where plates are sliding past each other |
| Alfred Wegener | proposed hypothesis of continental drift |
| mesosaurus | fossil remains found on east coast of SA and west coast of Africa |
