Across
- 8. the denser plate sinks below the more buoyant plate
- 9. ridges mountain ranges that are in the middle of the ocean
- 10. earth's surface is made of rigid slabs of rock, or plates, that move with respect to each other
- 11. forms where two plates slide past each other
- 14. forms where two plates collide
Down
- 1. where two plates separate
- 2. polarity a state in which magnetized objects would reverse direction and orient themselves to point south
- 3. pull as a slab sinks, it pulls on the rest of the plate with a force
- 4. drift suggested that continents are in constant motion
- 5. the theory that all continents were once all connected
- 6. the cold and rigid outermost rock layer
- 7. reversal occurs and the magnetic field reverses direction
- 12. the circulation of material caused by the differences in temperature and density
- 13. spreading process by which new oceanic crust forms along a mid-ocean ridge and older oceanic crust moves away from the ridge
- 15. polarity is a state in which magnetized objects, such as compass needles, will orient themselves to point north
- 16. push rising mantle material at mid-ocean ridges creates the potential for plates to move away from the ride with a for