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Chap17 vocab

QuestionAnswer
Wegener's hypothesis that Earth's continents were joined as a single landmass, that broke apart about 200 mya and slowly moved to their present positions. Continental drift
Ancient landmass made up of all continents that began to break apart about 200 mya. Pangaea
A device that can detect small changes in magnetic fields. Magnetometer
The flow in the outer core changes, and Earth's magnetic field changes direction. Magnetic reversal
The study of the history of Earth's magnetic field. Paleomagnetism
An imaginary line on a map that shows points that have the same age, that is formed at the same time. Isochron
The theory that explains how new ocean crust is formed at ocean ridges and destroyed at deep-sea trenches. Seafloor spreading
Huge pieces of crust and rigid upper mantle that fit together at their edges to cover Earth's surface. Tectonic plate
Regions where two tectonic plates are moving apart. Divergent boundaries
Continental crust begins to separate, the stretched crust forms a long, narrow depression. Rift valley
Two tectonic plates are moving toward each other. Convergent boundaries
Two plates collide, the denser plate eventually descends below the other, less-dense plate in a process. Subduction
Place where two tectonic plates slide horizontally past each another; is characterized by long faults and shallow earthquakes. Transform boundary
The weight of the uplifted ridge is thought to push the oceanic plate toward the trench formed at the subduction zone in a process. Ridge push
The weight of a subducting plate pulls the trailing slab into the subduction zone much like a tablecloth slipping off the table can pull articles off with it. Slab pull
Created by: jesse14
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