Chapter 7 Plate Tectonics

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