Across
- 2. Superman's worst nightmare
- 4. Has the symbol, 'W'
- 6. Needed for a healthy immune system
- 10. Sounds like a google app
- 12. Used to be used in pencils
- 14. Named after France
- 16. Named after a group of countries including Norway and Sweden
- 17. Essential for all life
Down
- 1. One of the two liquids on the periodic table
- 3. Used to make balloons
- 5. Very expensive and rare
- 7. Found most famously in milk
- 8. Used to test for starch
- 9. Used in batteries
- 11. Found in water
- 13. Needed to respire
- 15. 2nd place medal colour