Across
- 2. rules of law that must be followed by all
- 3. something that catches fire easily
- 7. when a sign tells you not to do it
- 9. has potential to cause harm
- 10. something that gets in the way
- 11. it is poisonous
- 12. process of letting fresh air in
Down
- 1. germs that are everywhere
- 4. to reduce a risk to the smallest possible
- 5. something that you must do
- 6. chemicals that can burn through skin
- 7. a measure taken in advance to prevent harm
- 8. practices that help to prevent disease