| A | B |
|---|
| rift | deep valley |
| mid ocean ridge | under sea mountains caused by sea floor spreading |
| trench | deep narrow canyon on the ocean floor |
| subduction zone | area where one plate sinks under another plate |
| fault | large break or crack in the crust |
| sea floor spreading | process of making new oceanic crust |
| molten rock | liquid rock |
| theia | Earths twin planet |
| convection currents | heating & cooling of magma in the mantle |
| tectonic plate | large broken section of the Earth's crust |
| plate boundary | where tectonic plates meet other plates |
| magma | liquid rock found in the mantle |
| pangaea | ancient super continent |
| sea mount | underwater mountain |
| continental drift | theory that just the continents move, not the plates |
