Science Class Crossword by Nathen Mekuria

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