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1.a change in Earth's magnetic field
4.ancient landmass made up of all the continents that began to break apart about 200 million years ago.
6.long, narrow depression that forms when continental crust begins to separate at a divergent rate.
11.places where two tectonic plates are moving apart
12.a line on a map that connects points that have the same age
2.places where two tectonic plates are moving toward each other
3.a place where two tectonic plates slide horizontally past each other.
5.Hess's theory that new ocean is formed at mid-ocean ridges and destroyed at deep-sea trenches; occurs in a continuous cycle of magma intrusion and spreading.
7.Wegner's hypothesis that Earth's continents were joined as a single landmass, called Pangea, that broke apart about 200 million years ago.
8.a device that can detect small changes in magnetic fields
9.the study of magnetic record
10.process by which one tectonic plate slips beneath another tectonic plate

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