Tectonic plates.

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Across
  1. 1. Pulls away from each other
  2. 3. caused by divergent
  3. 7. collide in each other
  4. 9. caused by convergent and transform boundaries
Down
  1. 2. slide past
  2. 3. caused by divergent boundaries
  3. 4. caused by transform boundary
  4. 5. caused by convergent boundaries
  5. 6. caused by convergent boundaries
  6. 8. caused by divergent boundaries