Plate Tectonics

2. the mountain ranges in the middle of the oceans
4. form where two plates collide
8. suggested that continents are inconstant motion on the surface of Earth
11. Earth's surface is made of a rigid slabs of rock, or plates, that move with respect to each other
12. the circulation of material caused by differences in temperature and density
14. the cold and rigid outermost rock layer
15. the denser plate sinks below the more buoyant place in a process
16. as a slab sinks, it pulls on the rest of the plate with a force

1. a state in which magnetized objects, such as compass needles, will orient themselves to point north
3. forms where two plates slide past each other
5. forms where two plates separate
6. rising mantle material at mid-ocean creates the potential for plates to move away form ridge with a force
7. occurs and the magnetic field reverses direction
9. a state in which magnetized objects would reverse direction and orient themselves to point south
10. all the continents were once part of a supercontinent
13. the process by which new oceanic crust forms along a mid-ocean ridge and older oceanic crust moves away from the ridge