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Chapter 17
Vocabulary
| Term | Definition |
|---|---|
| continental drift | Wegener's hypothesis that Earth's continents were joined as a single lanswass, called Pangaea, that broke apart about 200 mya and slowly moved to their present |
| Pangaea | ancient land mass made up of all the continents that began to break apart apart about 200 mya. |
| magnetometer | device used to map the ocean floor that detects small changes in magnetic ields. |
| magnetic reversal | When Earth's magnetic field changes polarit between normal and revesed. |
| paleomagnetism | study of Earth's magnetic record usin data gathred from ironbearign minerals in rocks that have recored the orientation of Earth's mamgetic field at the time of their formation. |
| isochron | Imaginary line on a map that shows pooints of the same age; formed at the same time. |
| seafloor spreading | the hyothesis that new ocean crust is formed a t mid-ocean ridges and detroyed at deep-sea trencehes, occurs in a cotinious cycle of magma intusion and spreading |
| tectonic plate | huge pieces of earth's cust taht cover its surface and fit togeterat their edges. |
| divergent boundary | place where two of Earth's tectonic plates are moving apart; is associated with colcansim, earthquakes, and high heat flow, and is found primarly on the seafloor. |
| rift valley | long, narrow depression that forms when continental crust begins to separate at a divergent boundary. |
| convergent boundary | place whre two tectonic plates are moving toward each other; is associated with trenches, island arces, and folded mountains. |
| subduction | process by which one tectonic plate slids beneath another tectonic plate. |
| transform boundary | place where two tectoic plates slide horizntally as t ech antother; is characterized by long faults and shallow earthquakes |
| Ridge Push | Tectonic process associated with convection currents in Earth;s mantel taht occurs when the weight of an elevate ridge pushes an oceanic plate toward a subduction zone |
| Slab pull | tectonic process associated with convection currents in Earths mantel that occurs as the weight of the subductioning plate pulls the trailing lithosphere into asubduction zone |
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louizatamez
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