| A | B |
|---|
| fossil | preserved remains |
| Pangaea | giant landmass from 200 + million years ago |
| theory of continental drift | Alfred Wegener's theory |
| midocean ridge | where new ocean floor is produced |
| ocean-floor spreading | process in which old ocean floor is pushed away |
| transform fault | fault that runs across a midocean ridge |
| trench | V shaped valley on ocean floor where old ocean floor is subducted |
| subduction | process in which crust plunges back into the interior of the Earth |
| theory of plate tectonics | the theory that links ocean floor spreading and continental drift |
| plate | one of the moving slabs that make up the Earth's Lithoshpere |
| tectonics | geology branch that deals with movements that shape Earth's crust |
| lithosphere | topmost solid part of the Earth |
| divergent boundary | plate boundary where plates move apart |
| convergent boundary | plate boundary where plates come together |
| strike-slip boundary | plate boundary at which 2 plates slip past one another horizontally |
| convection current | movement of material caused by temperature differences |
