| A | B |
|---|
| collision boundary | convergent boundary where two continents have come together |
| continental drift | hypothesis that Earth's continents move on Earth's surface |
| convergent boundary | boundary between two plates moving toward each other |
| craton | ancient core of a continent, which is tectonically stable |
| deep-sea trench | long, narrow, steep-sided trough that runs parallel to continental margins or to volcanic island chains |
| divergent boundary | boundary between two lithosperic plates that are moving apart |
| mantle convection | how heat from Earth's inner and outer cores is transfered through the mantle |
| mid-ocean ridge | chain of mountains with a central rift valley, located along a divergent boundary |
| pangaea | the name of a hypothetical landmass consisting of all the current landmasses welded together |
| plate tectonics | theory that the lithosphere is made of plates that move and interact with each other |
| ridge push | a force that is exerted by cooling |
| rift | crack or opening in Earth's crust |
| rift valley | deep valley where lithosperic plates are moving apart |
| slab pull | force at a subduction boundary where force is exerted on the sinking edge of a plate |
| subduction boundary | convergent boundary where an oceanic plate is plunging beneath another plate |
| terrane | large block of lithosperic plate that has been moved |
| transform boundary | boundary between two plates that are sliding past each other |
