| A | B |
|---|
| rift valley | A valley that forms on divergent boundaries |
| seismic waves | the speed of these waves is recorded |
| inner core | made of solid metal |
| asthenosphere | place where scientists think convection currents take place in the earth |
| convection currents | movement within the asthenosphere |
| hypthesis | an educated guess |
| radiation | heat transfer through empty space |
| conduction | must be touching to take place |
| temperature | measurement of the speed of molecules |
| lava | magma that has reached the surface of the earth |
| mantle | Largest layer of the earth |
| sonar | used to measure distance by sending sound waves |
| Alvin | first submersible to study the ocean floor |
| deep-ocean trench | "canyon" formed at a subduction zone |
| convergent | plates coming together |
| divergent | plates moving apart |
| transform | plates slipping slide by slide |
