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17 VOCAB ES

Earth Science 3rd Quarter

QuestionAnswer
Continental drift The gradual movement of the continents across the earth's surface through geological time
Pangaea A vast continental area or super continent comprising all the continental crust of the earth.
magnetometer Device used to map the ocean floor that detects small changes in magnetic fields.
magnetic reversal 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 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 and spreading
tectonic plate huge pieces of Earth's crust that cover it's surface and fit together at their edges.
divergent boundary 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
rift valley Long, narrow depression that forms when continental crust begins to separate at a divergent boundary.
convergent boundary Place where tow tectonic plates are moving toward each other; is associated with trenches islands arcs. and folded mountains.
subduction process by which one tectonic plate slips beneath another tectonic plate.
transform boundary Place where two tectonic plates slide horizontally past each another; 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 an elevated ridge pushes an oceanic plate toward a subduction zone.
slab pull tectonic process associated with convection currents in Earth's mantle that occurs the weight of the subducting plate pulls the trailing lithosphere into a subduction zone.
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