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Science
Chapter 3 Review
| Term | Definition |
|---|---|
| continental drift | Wegener's idea that the continents slowly moved over Earth's surface. |
| Pangaea | A supercontinent that Wegener named. |
| fossil | Any trace of an ancient organism that has been preserved in rock. |
| mid-ocean ridge | Form large chains of mountains that rise up from the ocean floor. |
| sea-floor spreading | Adds more crust to the ocean floor. At the same time older strips of rock move outward form either side of the ridge. |
| deep-ocean trenches | In a process taking tens of millions of years, part of the ocean floor sinks back into the mantle at deep-ocean trenches. |
| subduction | the process by which the ocean floor sinks beneath a deep-ocean trench and back into the mantle again. |
| divergent boundary | where plates move apart from each other |
| convergent boundary | where plates come together and COLLIDE (with no big explosions to watch D;) |
| transform boundary | where plates slip past each other |
| plate tectonics | the theory of pate tectonics states that Earth's plates are in slow, constant motion, driven by convection currents in the mantle |
| fault | breaks in Earth's crust where rocks have slipped past each other |
| rift valley | where pieces of Earth's crust diverge on land |
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