Chapter 7 vocab

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