Science finish the sentence

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Across
  1. 2. dioxide
  2. 4. cells
  3. 7. of space
  4. 9. of matter
  5. 10. to breath
Down
  1. 1. is gas to liquid
  2. 3. is solid to liquid
  3. 5. is liquid to gas
  4. 6. is gas to solid
  5. 8. is liquid to solid