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4.Place where two tectonic plates are moving apart.
6.Ancient landmass made up of all the continents that began to break apart about 200 million years ago.
9.The weight of a sub ducting plate helps pull the trailing lithosphere into a subduction zone.
10.Long, narrow depression that forms when continental crusts begins to separate at a divergent boundary.
11.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.
12.places where two tectonic plates are moving toward each other.
13.A place where two plates slide horizontally past each other.
14.A line on a map that connects points that have the same age.
15.process by which one tectonic plate slips beneath another tectonic plate.
1.States that Earth's crust and upper mantle are broken into plates,which are huge rock slabs that move in different directions and at different directions and a t different rates over Earth's surface.
2.The weight of the uplifted ridge is thought to push an oceanic plate toward the trench formed at the subduction zone.
3.Hess's theory 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.
5.A device that can detect small changes in magnetic fields.
7.A change in Earth's magnetic field.
8.Wegener's hypothesis that Earth's continents were joined as a single landmass called pangaea that broke apart about 200 million years ago.

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