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chapter 3 lesson 1-3
Plate tectonics chapter 3
| Question | Answer |
|---|---|
| continental drift | The hypothesis that continents slowly move across earth's surface |
| Pangaea | The name of a single landmass that began to break apart 200 million years ago and gave rise to today's continents |
| fossil | The preserved remains or traces if an organism that lived in the past |
| mid-ocean ridge | A 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 a mantle at a converged 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 past each other in opposite directions |
| 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 Earth's crust along which rocks move |
| rift valley | A deep valley that forms where two plates move apart |
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