Plate Tectonics

3. the cold and rigid outermost rock layer
4. a state in which magnetized objects such as compass needles will orient themselves to point north
5. process by which new oceanic crust forms along a mid ocean ridge and older oceanic crust moves away from the ridge
7. mountain ranges in the middle of the oceans
9. the denser plate sinks below the more buoyant plate
11. earths surface is made of rigid slabs of rock or plates that move with respect to each other
13. which magnetized objects would reverse direction and orient to look south
15. forms where two plates collide
16. forms where two plates slide past each other

1. circulation of material caused by differences in temperature and density
2. forms where two plates serperate
6. all the continents were once a supercontinent
8. suggested that continents are in constant motion on the surface of earth
10. as a slab sinks it pulls on the rest of the plate
12. magnetic fields reverse direction
14. rising mantle material at mid-ocean ridges creates the potential for plates to move away from the ridge