| A | B |
|---|
| Crust | surface layer of the earth |
| Convection current | movement of material caused by difference in temperature |
| Plate tectonics | the movement of the plates which explains the change in the earth |
| Mid-ocean-ridge | an undersea mountain chain where new ocean floor is produced |
| Ocean-floor spreading | process in which ocean floor is pushed away from the mid-ocean ridge by the formation of new ocean floor |
| Divergent | plates that move away from each other |
| Convergent | plates that move towords each other |
| Strike slip | plates that move parallel and opposite directions from each other |
