Plate Tectonics

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Across
  1. 3. American Geologist and U.S. Naval Officer that studied the mid-ocean ridge
  2. 4. Gravity moves plates by pulling them down at ________
  3. 7. The force that pulls objects towards the Earth
  4. 8. The theory describing how Earth’s plates move and what happens when they interact with each other
  5. 10. Scientists suggested that the ocean floor moves like ________
  6. 11. The kind of crust that is thicker, less dense and older
  7. 12. The formation of a new crust at a ________ pushes the old crust out of the way
Down
  1. 1. The kind of crust that is thinner, more dense and younger
  2. 2. Pressure moves the plates as rising ________ pushes at the mid-ocean ridge
  3. 5. This is HOW the continents drift!
  4. 6. The force that pushes outward against the space around it
  5. 9. The cycle where substances rise and fall because of changes in temperature and density