| A | B |
|---|
| Convection Current | Circular movement of mantle material |
| Convergent Plate Boundary | A tectonic plate boundary in which two plates come together. |
| Divergent Plate Boundary | A tectonic plate boundary in which two plates move apart. |
| Fault | Fracture in rock caused by stress. |
| Folding | The deformation of rock layers due to compressive forces and heat. |
| Fossils | Preserved remains or traces of ancient organisms |
| Island Arcs | Landform created when two oceanic plates collide and the denser of the two plates is subducted. |
| Lithosphere | The Earth’s surface layer consisting of the topmost rigid portion of the mantle plus oceanic and continental crusts. |
| Magma | Molten rock beneath the Earth’s surface. |
| Mid-Ocean Ridge | A large undersea mountain chain where new ocean floor is produced. |
| Mountain Range | Landform created when continental plates collide and continental crust is pushed together and upward. |
| Pangaea | The last (most recent time) Earth was once a large single landmass called Pangaea, meaning “all lands” in Greek. |
| Oceanic & Continental | Types of Earth’s crust. Oceanic is more dense, so it will subduct in a collision with continental crust. |
| Ocean-Floor Spreading | The process in which old ocean floor is pushed away from a mid-ocean ridge by the formation of a new ocean floor. |
| Rift | Zone between two diverging tectonic plates. |
| Subduction | The process in which crust plunges back into the interior of the Earth. Subduction occurs at convergent plate boundaries. |
| Theory of Plate Tectonics | The theory that the Earth is made up of plates that through continental drift and ocean floor spreading has 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 (and denser/heavier) ocean floor is subducted. |
