Plate Tectonics

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Across
  1. 4. the outer edge of something
  2. 5. pull apart
  3. 7. molten rock
  4. 9. two plates colliding
  5. 10. the speed
Down
  1. 1. ray of energy
  2. 2. one plate sliding under another plate
  3. 3. the mass of a substance per unit volume
  4. 6. slide past
  5. 8. the thin outer most layer of earth