Science Chapter 3
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14 terms
Terms | Definitions |
|---|---|
 Continental Drift | the hypothesis that the continents slowly move across Earth's surface |
| Pangaea | The supercontinent formed near the end of the Paleozoic era when plate movements brought all the landmasses of Earth together. |
| Fossil | the remains (or an impression) of a plant or animal that existed in a past geological age and that has been excavated from the soil |
| Mid-Ocean Ridges | an undersea mountain chain |
| Sea-Floor Spreading | The process that creates new sea floor as plates move away from each other at the mid-ocean ridges |
| Deep-Ocean Trenches | Underwater cayons formed when the oceanic crust bends downward |
| Subduction | the process by which oceanic crust sinks beneath a deep-ocean trench and back into the mantle at a convergent plate boundary |
| Plates | large pieces of earths crust that move due to convection currents |
| 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 | boundary between two plates that are sliding past each other. |
| Plate Tectonics | the theory that pieces of Earth's lithosphere are in constant motion, driven by convection currents in the mantle |
| Faults | cracks in the earth's crust |
| Rift Valley | A deep valley that forms where two plates move apart. |
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