Across
- 3. an explanation of observations
- 5. Handle these substances with care
- 8. The study of light, sound etc
- 10. These substances can cause chemical burns
- 11. These substances can easily catch fire
- 12. The study of living things
Down
- 1. Elements, atoms
- 2. a safety symbol shown by a skull
- 4. What happens if these substances are ignited
- 6. educated guess
- 7. These substances produce heat
- 9. glass for eye protection