Across
- 3. animals breathe it out
- 4. found in water
- 8. used in car battery
- 9. gas used in lighter fluid
- 10. found in earths atmosphere
- 12. gas used in bright signage
- 13. acid found in citrus fruits
- 14. helps fruit ripen
- 15. used on cooking on a grill
- 17. its in pools
- 18. used to preserve specimens
- 19. produced by decomposing organic matter
Down
- 1. comes from volcanos
- 2. used in cleaning electronics
- 5. found in nail polish remover
- 6. found in fire extinguishers
- 7. gas from car exhaust
- 11. gas you breathe in
- 15. acid found in soft drinks
- 16. its in cleaner