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C3 Plate tectonics
| Term | Definition |
|---|---|
| Continental drift | The hypothesis that the continents move slowly across earth's surface |
| Pangaea | The name of the single landmass that began to break apart 200 million years ago and gave rise to today's continents |
| fossil | The preserved remains or traces of an organism that lived in the past |
| Mid-ocean ridges | An undersea mountain chain where new ocean floor is produced |
| Sea-floor spreading | The process by which molten material adds new oceanic crust to the ocean floor |
| Deep-ocean trench | A deep valley along the ocean floor beneath which oceanic crust slowly sinks toward the mantle |
| subduction | The process by which oceanic crust sinks beneath a deep-ocean trench and back into the mantle at a convergent late boundary |
| plate | A section of lithosphere that slowly moves over the asthenosphere, carrying the pieces of continental and oceanic crust |
| Divergent boundary | A plate boundary where two plates move away from each other |
| Convergent boundary | A plate boundary where two plates move toward each other |
| Transform boundary | A plate boundary where two plates move past each other in a opposite direction |
| Plate tectonics | The theory that pieces of earth's lithosphere are in constant motion, driven by convection currents in the mantle |
| fault | A break in earths crust along which rocks move |
| Rift valley | A deep valley that forms where two plates move apart. |
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