| A | B |
|---|
| Hot spot | a colum of sizzling rocks that rise from the mantle. |
| Seismograph | An instrument that detects seismic waves/earthquake waves. |
| Mid-Ocean Ridge- | An under sea mountain chain, where new ocean floor is produced. |
| Trenches | A V shaped valley on the ocean floor where old ocean floor is subticted. |
| Lithosphere | The topmost solid part of Earth which is composed. |
| Theory of Plate Tectonics | Continetal Drift and ocean floor spreading explains how the Earth has evolved over time. |
| 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. |
| Ring or Fire | The earthquake and volcano zone which encircles the Pacific Ocean. |
| Pangaea | The single giant landmass that exsisted over 200 million yrs. ago. |
| Mantle | The layer of Earth that extends from the bottom crust to the core. |
| Fault | A break or crack along which rocks move. |
| Molten Rock | Magma that is hardened. |
| Convergent,Divergent Boundaries | Convergent:Connecting; Divergent:Going away. |
| Convection Currents | A movement of material caused by differences in temp. |
| Magma | Molten Rock beneath the Earth's surface. |
| Richter Scale | The scale used to measure the strength of earthquakes. |
