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Chapter 17
| Term | Definition |
|---|---|
| Continental drift | the idea that Earth's continents had once been joined as a single landmass that broke apart and sent the continents adrift. |
| Pangaea | the supercontinent |
| Magnetometer | a device that can detect small changes in magnetic fields |
| Magnetic reversal | happens when the flow in the outer core changes, and Earth's magnetic field changes direction |
| Paleomagnism | the study of the history of Earth's magnetic field |
| Isochron | an imaginary line on a map that shows points that have the same age- that is, they formed at the same time. |
| Seafloor spreading | the theory that explains how new ocean crust is formed at ocean ridges and destroyed at deep-sea trenches |
| Tectonic plate | huge pieces of crust and rigid upper mantle that fit together at their edges to cover Earth's surface |
| Divergent boundary | regions where two tectonic plates are moving apart |
| Rift valley | when continental crust begins to seperate, the stretched crust forms a long, narrow depression |
| Convergent boundary | two tectonic plates are moving toward each other |
| subduction | when two plates collide, the denser plate eventually descends below the other, less-dense plate |
| Transform boundary | a region where two plates slide horizontally past each other |
| ridge push | a process in which the older portion of the seafloor sinks, the weight of the uplifted ridge is thought to push the oceanic plate toward the trench formed at the subduction zone |
| slab pull | the weight of the subducting plate pulls the trailing slab into the subduction zone |
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spjaco
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