7th grade Ch. 9 Science vocab

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