Across
- 1. Odorless
- 4. highly reactive
- 11. 5th most abundant in Earth's crust
- 14. used for scuba diving
- 17. turns yellow/pink when exposed to air
- 18. 2% of earth's crust
- 19. bugs die when they come in contact with it
- 22. Toxic Gas
- 23. can float on water
Down
- 2. colorless
- 3. 30% of Earth crust
- 5. need for healthy joints
- 6. conductor
- 7. can be found in pools
- 8. discovered in 1791 forgotten and rediscovered
- 9. 20% of human bodies
- 10. 90% of atoms
- 12. essential for human nutrition
- 13. 100% recyclable
- 15. lightest metal
- 16. 25% of the nickel
- 17. melts at 1410 c
- 20. not all of it's variations are metal
- 21. has rich blue hue