Hot Air Balloon

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Across
  1. 4. going up
  2. 6. carry up
  3. 8. to float
  4. 9. pushing up or down
  5. 10. letting air/gas out
  6. 12. slows object down
  7. 13. the balloon
  8. 14. allows fire to go
Down
  1. 1. carries people or things
  2. 2. the base of the envelope
  3. 3. pushing down
  4. 5. opens to make it descend
  5. 7. light materials
  6. 8. makes fire for balloon
  7. 11. fill in
  8. 12. per unit of volume