| A | B |
|---|
| plate | a section of the lithosphere that slowly moves over the asthenosphere, carrying peices of continental and oceanic crust |
| divergent boundary | plates move apart or diverge from each other |
| transform boundary | two plates move past each other in opposite directions |
| plate tectonics | the theory that pieces of Earth's lithosphere are in constant motion, driven by convection currents in the mantle |
| rift valley | when Earth's crust diverge (move apart) on land a deep valley will form |
| fault | a break in Earth's crust along which rocks move |
| convergent boundary | plates come together or converge |
| convection currents | drive Earth's plate |
