Science and Nature

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Across
  1. 1. Largest planet in the solar system
  2. 6. Earth's closest star
  3. 9. Chemical symbol for gold
  4. 11. Process of evolution
  5. 13. Study of living organisms
  6. 15. Unit of measurement for energy
  7. 17. Building blocks of matter
  8. 19. Compound essential for life
  9. 20. Process of converting sunlight into energy
Down
  1. 2. Electrically charged particle
  2. 3. Study of celestial bodies
  3. 4. Particle smaller than an atom
  4. 5. Force that attracts objects
  5. 7. Outer layer of the Earth
  6. 8. Body's control center
  7. 10. Study of the Earth's atmosphere
  8. 12. Source of Earth's heat
  9. 14. Protective layer in the atmosphere
  10. 16. Natural disaster caused by tectonic plates
  11. 18. Earth's natural satellite