Science

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Across
  1. 2. Infrared
  2. 5. Molecule
  3. 8. physics
  4. 10. Bigbang
  5. 12. Supernova
  6. 14. Cation
  7. 16. Periodic
  8. 19. Element
Down
  1. 1. Airresistance
  2. 3. Hydrogen
  3. 4. Sun
  4. 6. Oxygen
  5. 7. Potassium
  6. 9. science
  7. 11. Gravity
  8. 13. atom
  9. 15. Nuclear
  10. 17. Ion
  11. 18. Helium