Across
- 3. The type of air that we breathe out
- 4. Petrol is used as a ____ to cars
- 6. To put out a fire you ___ it
- 7. This comes from fire
- 9. A mix of hydrogen and carbon dioxide
- 10. The type of air that we breathe in
- 11. The fire is ____ the paper
Down
- 1. This is a type of fuel
- 2. The topic this crossword is on
- 5. 70% of the world is ___
- 8. Three elements are needed to make a ___