Chapter 7 Vocabulary

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