science trivia

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Across
  1. 2. Study of heat and energy
  2. 6. — Force keeping objects on the ground
  3. 7. — Center of our solar system
  4. 8. Fundamental particle in physics
  5. 9. Community of interacting organisms
  6. 11. Nutrient important for body repair
  7. 13. Process of change in species over time
  8. 14. — Most abundant gas in Earth's atmosphere
  9. 19. Substance that stimulates immunity
  10. 22. Force exerted by magnets
  11. 23. Basic unit of matter
  12. 24. Atoms with same element but different neutrons
  13. 27. Protective layer in atmosphere
  14. 28. — How plants convert sunlight into energy
  15. 29. Preserved remains of ancient life
Down
  1. 1. Nerve cell
  2. 3. — Hardest natural substance
  3. 4. Study of matter and energy
  4. 5. Tool to see tiny objects
  5. 10. Negatively charged particle
  6. 12. — Chemical formula for water
  7. 13. — Developed theory of relativity
  8. 15. Massive system of stars
  9. 16. — Gas living beings breathe
  10. 17. — The Red Planet
  11. 18. Particle with no electric charge
  12. 20. Carries genetic information
  13. 21. Book of maps (used in biology for muscles, but also geographic)
  14. 25. — Largest human organ
  15. 26. Pigment in plants