| A | B |
|---|
| lithosphere | earth's crust and upper mantle |
| convection current | heat transfer by the movement of the heated liquid or gas |
| Pangea | a whole continent long long ago, 没有分离的整块古大陆 |
| convergent boundary | 2 plates are colliding as they move toward each other |
| divergent boundary | where two tectonic plates are moving away from one another |
| strike-slip boundary | 2 plates move alongside each other in opposite direction= transverse fault |
| inner core | solid, innermost layer of the earth |
| trench | deep V-shaped valley along the ocean floor |
| plate | a large section of the crust that reacts to tectonic forces as a unit and moves as such |
| theory of plate tectonics | continental drift + ocean-floor spreading |
| mid-ocearn ridge | large system of underwater mountains, 海底火山带 |
| crust | thin outermost layer of the earth |
| mantle | layer between the crust and the earth's core |
| subduction | Plates hit each other that results in one plate come under another. |
