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Chapter 17 voCaB!@#

voculary

QuestionAnswer
which proposed that earth's continents had once been joined as a single landmass that broke apart. Continental Drift
ancient landmass made up of all the continents that began to break apart about 200 mya. Pangaea
device used to map the ocean floor that detects small changes in magnetic fields. Magnetometer
when Earth's magnetic field changes polarity between normal and reversed. magnetic reversal
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. paleomagnetism
imaginary line on a map that shows points of the same age, formed at the same time. isochron
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. seafloor spreading
are 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 boundary
when continental crust begins to separate, the stretched crust forms a long, narrow depression. rift valley
two tectonics are moving toward each other. convergent boundary
when two plates collide, the denser plate eventually descends below the other, less-dense plate. subduction
a region where two plates slide horizontally past each other. transform boundary
weight of the uplifted ridge is thought to push the oceanic plate toward the trench formed at the subduction zone. ridge push
the weight of a subducting plate pulls the trailing slab into the subduction zone. slab pull
Created by: jesusdelacruz
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