science vocab ch.9

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Across
  1. 3. - The circulation of material caused by differences in temperature and density
  2. 5. ridge - The mountain ranges in the middle of the oceans
  3. 6. - continents that were once a part of a supercontinent.
  4. 8. boundary - forms where two plates slide past each other
  5. 9. boundary - forms where two plates separate
  6. 10. - The denser sinks below the more buoyant plate
Down
  1. 1. tectonics - Earth’s surface is made of rigid slabs of rocks, or plates, that move with respect to each other
  2. 2. drift - continents that are in constant motion on the surface of Earth
  3. 4. spreading - The process by which new oceanic crust forms along a mid-ocean ridge and older oceanic crust moves away from the ridge
  4. 5. reversal - When the magnetic field reverses direction
  5. 7. boundary - forms where two plates collide