Science Class Crossword by Nathen Mekuria

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