Plate Tectonic

3. Valley when continental crust begins to separate, the stretched crust forms a long narrow depression
4. Boundary two tectonic plates are moving toward each other
6. Boundary a region where two plates slide horizontally past each other, crust is neither destroyed nor formed
7. basalt rock of sea floor records changing of earth’s magnetic field
10. He knew that the continents moved but, did not show how they continents moved.
11. the study of the alignment of magnetic minerals in rock, specifically relating to the reversals of Earth's magnetic poles
13. Boundary regions where two tectonic plates are moving apart. Most are found along the seafloor in rift valleys
15. the outer layer of the Earth
17. Spreading the theory that explains how new ocean crust is formed at ocean ridges and destroyed at deep-sea trenches

1. an imaginary line on a map that shows points that have the same age
2. Arc as oceanic crust of the sinking plate melts, magma rises through the top plate, over time the flows build up a series of islands
4. Drift continents can move away from each other and have done so in the past.
5. The zone of the mantle beneath the lithosphere that consists of slowly flowing solid rock
7. Reversal process in which Earth's north and south magnetic poles have switched places many times throughout Earth's history
8. Push the process when the older portion of the seafloor sinks and the weight of the uplifted ridge is thought to push the oceanic plate toward the trench formed at the subduction zone
9. the solid part of the earth consisting of the crust and outer mantle
11. All lands named for super continent.
12. the process when two plates collide and the denser plate, eventually descends below the other, less-dense plate, three types are oceanic-oceanic, oceanic-continental and continental-continental
14. long, narrow ditch.
16. Pull the weight of a subducting plate pulls the trailing slab into the subduction zone much like a table cloth slipping off the table can pull articles off with it