plate tectonics

3. A curved line of volcanoes that form a parallel to a plate boundary
5. Mountain ranges in the middle of the oceans
7. Parallel ridges that form where blocks of crust move up or down along faults
9. When magnetized objects would reverse direction orient themselves to point geographically south
10. Deep underwater troughs created by one plate subducting under another plate at a convergent plate boundary
11. continents are in constant motion on the surface of the earth
12. When large regions rise vertically with very little deformation

1. hypothetical supercontinent that included all current land masses, believed to have been in existence before the continents broke apart during the Triassic and Jurassic Periods
2. made up of layers of rocks that are folded
4. Magnetic field reverses direction
6. Process by which oceanic crust forms along a mid ocean ridge and older oceanic crust moves away from the ridge.
8. A state in which magnetic objects will orient themselves to point geographically north