Chapter 7 Vocabulary

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Across
  1. 5. drift which suggested that continents are in constant motion on the surface of Earth
  2. 7. polarity is a state in which magnetized objects
  3. 8. tectonics is Earth's surface that us made of rigid slabs of rock, or plates, that move with respect to eachother
  4. 9. the circulation of material caused by differences in temperature and density
  5. 11. ridges are longer than any mountaint range on land
  6. 13. spreading is the process by which new oceanic forms along a mid-ocean ridge and older oceanic crust moves away from the ridge
  7. 15. push the rising mantle material at mid-ocean ridges creates the potential for plates to move away from the ridge with a force
Down
  1. 1. is the denser plates that sink below the more buoyant plate in a process
  2. 2. plate boundary forms where two plates separate
  3. 3. plate boundaries form where two plates collide
  4. 4. reversal occurs and the magnetic field reverses direction
  5. 6. plate boundary forms where two plates slide past eachother
  6. 8. idea that all of the continents were part of a supercontinent
  7. 10. is the cold and rigid outermost rock layer
  8. 12. pull a slab sinks it pulls on the rest of the plate with a force
  9. 14. polarity is a state in which magnetized objects would reverse direction and orient themselves to point south