chapter 7 vocabulary

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