Chapter 7 -- Plate Tectonics

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Across
  1. 2. the circulation of material caused by differences in temperature and density
  2. 5. a plate boundary where two plates slide past each other
  3. 6. magnetized objects reorientate themselves with the poles
  4. 8. the process of new oceanic crust forming along a mid-ocean ridge and older oceanic crust moves away from the ridge
  5. 11. the supercontinent
  6. 12. Earth's surface is made of rigid slabs of rock, or plates, that move
  7. 13. when the magnetic field reverses direction
  8. 15. Mountain ranges in the middle of the ocean
  9. 16. when the denser plate sinks below the more buoyant plate
Down
  1. 1. cold and rigid outermost rock layer
  2. 3. the force causing causing mantel material to rise at mid-ocean
  3. 4. a plate boundary where two plates collide
  4. 7. continents are always in motion
  5. 9. normal _______ is a state where magnetized objects orient themselves to point towards the north pole; ex: a compass
  6. 10. a plate boundary where two plates separate
  7. 14. the force that pulls on the rest of the plate as a slab sinks