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Plate Tectonics
Stack #181489
| Question | Answer |
|---|---|
| Earth's continents had once been joined | continental drift |
| supercontinent | Pangaea |
| supporter of continental drift theory | Alfred Wegener |
| a device that can detect small changes in magnetic fields | magnetometer |
| the study of magnetic record | paleomagnetism |
| a change in Earth's magnetic field | magnetic reversal |
| a theory stating that new ocean crust is formed at ocean ridges and destroyed at deep-sea trenches | seafloor spreading |
| a theory stating that Earth's crust and rigid upper mantle are broken into enormous slabs called plates | plate tectonics |
| places where two tectonic plates are moving apart | divergent boundaries |
| when continental crust begins to separate, the stretched crust form a long, narrow depression | rift valley |
| places where two tectonic plates are moving toward each other | convergent boundaries |
| one of the two plates is descending beneath the other | subduction |
| a place where two plates slide horizontally past each other | transform boundary |
| the weight of the uplifted ridge is thought to push an oceanic plate toward the trench formed at the subduction zone | ridge push |
| the weight of a subducting plate helps pull the trailing lithosphere into the subduction zone | slab pull |
Created by:
ceadams00
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