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Chapter 17 Vocab
Vocab
| Term | Definition |
|---|---|
| Continental Drift | Wegener's hypothesis that earth's continents were joined as a single land mass called pangaea that broke apart about 200 mya and slowly moved to their present positions |
| Pangara | Ancient landmass made up of all the continents that began to break apart about 200 mya |
| Magnetometer | Device used to map the ocean floor that detects small changes in magnetic fields |
| Magnetic Reversaal | When earth's magnetic field changes polarity between normal and reversed |
| Paleomagnetism | Study of earth's magnetic record using data gathered from iron-bearing minerals in rocks that have recorded in the orientation of earth's magnetic field at the time of their formation |
| Isochron | Imaginary line on a map that shows points of the same age; formed at the same time |
| Seafloor Spreading | The hypothesis that new ocean crust is formed at mid-ocean ridges and destroyed at deep-sea trenches; occurs in a continuous cycle of magma intrusion spreading |
| Tectonic Plates | Huge pieces of crust and rigid upper mantle that fit together at their edge to cover earths surface |
| Divergent boundaries | Place where two of earth's tectonic plates are moving apart; is associated with volcanism, earthquakes, and high heat flow, and is found primarily on the sea floor |
| Rift valley | Long, Narrow depression that forms when continental crust begins to separate at a divergent |
| Convergent Boundaries | Place where two tectonics plates are moving toward each other; is associated with trenches, islands arcs, and folded mountains |
| Subduction | Process by which one tectonic plate slides beneath another tectonic plate |
| Transform Boundary | Places where two tectonic plates slide horizontally past each other; is characterized by long faults and shallow earthquakes |
| Ridge Push | Tectonic process associated with convection currents in earth's mantle that occurs when the weight of the elevated ridge pushes an oceanic plate toward a subduction zone |
| Slab Pull | Tectonic process associated with convection currents in earth's mantle that occurs as the weight of the subducting plate pulls the trailing lithosphere into subduction zone |
Created by:
Deonna2014
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