| Term | Definition |
|---|
| Mid-ocean ridge | The youngest rocks on the ocean floor are found in the center of the.. |
| Subduction | The process in which the Earth's crust plunges back into the Earth is know as |
| Pangaea | The theory that the earth was once a single landmass |
| Fossils | the preserved remains of ancient organisms |
| Glossopteris | an organism whose fossils provide evidence for continental drift |
| Continental Drift | The theory that the Earth once had a single landmass that broke up into large pieces |
| Ocean Floor Spreading | The process when the ocean floor moves away on either side of a midocean ridge, lava wells up and hardens forming a new ocean floor |
| Psychrometer | An instrument used to measure relative humidity |
| Trench | A V-shaped valley on the ocean floor where old ocean floor is subducted |
| Barometer | An instrument used to measure air pressure |
| Crust | The topmost solid part of the Earth |
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