Across
- 2. It constitutes about 0.001 percent by weight
- 4. Trees
- 6. It is used for fuel
- 7. helps maintain the balance of water in and Around your cells
- 9. used in black gunpowder, matches, and fireworks
- 11. Earth's crust
- 13. teeth
- 14. used for tin
- 17. highly toxic
- 18. Unlucky number
- 19. used in explosives
- 21. makes your voice go funny
Down
- 1. number one
- 3. Banana
- 5. 33 - 21 =? ? x 6 =? ?- 57 =?
- 8. is the third-most abundant gas in the Earth's Atmosphere lets us breath
- 10. Very light metal
- 12. Helps us stay strong and healthy
- 15. Hurts the eyes
- 16. Be
- 20. glow stick