| A | B |
|---|
| asthenosphere | the soft layer of the earth |
| convergent boundary | where two plates come together |
| heat transfer | the movement of energy from a warmer object to a cooler object |
| radiation | transfer of heat through empty space |
| conduction | heat transfer by direct contact |
| convection | heat transfer by movement of a heated liquid |
| Wegener | scientist who proposed the continental drift theory |
| continental drift | threory that states all continents had once been a supercontinent |
| sea-floor spreading | process that continually adds new material to the ocean floor |
| Hess | scientist who proposed idea of sea-floor spreading |
| subduction | process by which the ocean floor sinks beneath a deep-ocean trench |
| plate tectonics | explains that movement, formation, and subduction of Earth's plates |
| transform boundary | where two plates slide past each other in opposite directions |
| divergent bondary | place where two plates move apart |
| outer core | the part of the core that is made of molten material |
