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Lessons 1-3
| Continental Drift | the hypothesis that the continents slowly move across Earth's surface |
| Pangaea | the name of the single landmass that 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 Ridge | an undersea mountain chain where new ocean floor is produced; a divergent plate boundary |
| 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 plate boundary |
| Plate | a section of the lithosphere that slowly moves over the asthenosphere, carrying 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 pat each other in opposite directions |
| Plate Techtonics | the theory that pieces of Earth's lithosphere are in constant motion, driven by convection currents in the mantle |
| Fault | a break in Earth's crust along which rocks move |
| Rift Valley | a deep valley that forms when two plates move apart |
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