| A | B |
|---|
| Convection Currents | Circular movement of the mantle materials caused by differences in temperature |
| Convergent Plate Boundary | A tectonic plate boundary in which two plates move towards each other |
| Divergent Plate Boundary | A tectonic plate boundary in which two plates move away from each other |
| Fault | Fracture in rock caused by stress |
| Folding | The deformation of rock layers caused by pressure and heat |
| Fossils | Preserved remains or traces of ancient organisms |
| Island Arcs | Landform created when two oceanic plates collide and the denser, older plate subducts under the other |
| Lithosphere | Earth's surface layer consisting of the topmost rigid layer of the mantle and the crust |
| Magma | Molten rock beneath the earth's surface |
| Mid-Ocean Ridge | A large undersea mountain chain shere new ocean floor is produced |
| Mountain Ranges | Landforms created when continental plates collide and crust is pushed together and upward |
| Pangea | The most recent single landmass |
| Oceanic & Continental | Types of Earth's crust |
| Ocean-Floor Spreading | The process in which old ocean floor is pushed away from a mid-ocean ridge forming new ocean floor |
| Rift | Zone between two diverging plates |
| Subduction | The process in which crust plunges back into the interior of the Earth. |
| Theory of Plate Tectonics | Theory that Earth is made up of plates that through continental drift and ocean floor spreading have moved and continue to move. |
| Transform Fault | A boundary in which two plates slip past one another. |
| Trench | V-shaped valley on the ocean floor where old oceanic crust is subducted under newer oceanic crust. |
