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Chapter 17 - Plate Tectonics

Horizontales
long, narrow depression that forms when continental crust begins to separate at a divergent boundary.
huge pieces of Earth’s crust that cover its surface and fit together at their edges.
process by which one tectonic plate slips beneath another tectonic plate.
device used to map the ocean floor that detects small changes in magnetic fields.
study of Earth’s magnetic record using data gathered from iron-bearing minerals in rocks that have recorded the orientation of Earth’s magnetic field at the time of their formation.
place where two tectonic plates are moving toward each other; is associated with trenches, islands arcs, and folded mountains.
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 seafloor.
ancient landmass made up of all the continents that began to break apart about 200 mya.
Wegener’s hypothesis that Earth’s continents were joined as a single landmass, called Pangaea, that broke apart about 200 mya and slowly moved to their present positions.
Verticales
imaginary line on a map that shows points of the same age; formed at the same time.
when Earth’s magnetic field changes polarity from normal to reversed.
place where two tectonic plates slide horizontally past each another; is characterized by long faults and shallow earthquakes.
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 and spreading.