Across
- 4. the lightest element
- 6. mostly found in thermometers
- 7. You need it to breath
- 9. Mostly found in light-up signs
- 10. Makes your voice higher
Down
- 1. Cans and foil are made out of this
- 2. conducts electricity really well
- 3. lightest element
- 5. Highly radioactive
- 8. High value