Across
- 4. _____ wear
- 6. Used for wires
- 7. Is in all pencils
- 8. _____ dioxide
- 10. CaF2
- 13. is used for poison, atomic number is 33
- 14. one of the most well-known minerals on earth
- 15. Only mineral with the hardness of 10
Down
- 1. 75% of the earth
- 2. Metal that people mine for
- 3. planet closest to the sun
- 5. Number 26 on the periodic table
- 9. atomic symbol is 5
- 11. Elastic metal
- 12. when water freezes