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Science Crossword Puzzle

22 words

Across

  • 3. Negatively charged atomic particle
  • 4. Gas we breathe to survive
  • 5. Splitting an atomic nucleus
  • 11. Electric potential difference
  • 12. Temperature scale where water freezes at zero
  • 13. Lightest and most abundant element
  • 15. How plants convert sunlight to food
  • 16. Physics of very small particles
  • 18. Nuclear reaction powering the sun
  • 20. When one celestial body blocks another
  • 21. Uncharged particle in an atom

Down

  • 1. Force that keeps us on Earth
  • 2. Element essential to all life
  • 3. Protein that speeds up reactions
  • 6. Range of light wavelengths
  • 7. Fourth state of matter
  • 8. Object that attracts iron
  • 9. Noble gas that makes balloons float
  • 10. Cell division process
  • 14. Particle of light
  • 17. Center of an atom
  • 19. Water movement through a membrane
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