| A | B |
|---|
| basalt | the type of rock that makes up oceanic crust |
| subduction | the sinking of one tectonic plate under another |
| radiation | the transfer of heat through empty space |
| Alfred Wegener | first proposed the theory of continental drift |
| molten material | erupts through the valley of the mid-ocean ridge |
| convection current | the movement of fluid or gases in a cirucular motion caused by heat |
| lithosphere | solid layer that contains both crust and mantle |
| heat transfer | when a hotter object gives heat to a cooler object |
| seismic waves | used by geologists to study the Earth's interior |
| pressure | a force that pushes on an object or area |
| trench | a landform created by subduction when two plates meet |
| rift valley | forms at a divergent boundary |
| sonar | used by scientists to map the ocean floor |
| transform boundary | San Andreas Fault |
| convergent boundary | occurs when tectonic plates collide |
| mid-ocean ridge | the feature of the ocean floor that allows molten material to push up and out of the mantly |
