General Knowledge

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Across
  1. 2. Essential gas for human respiration
  2. 4. System of government by the people
  3. 8. Process of gradual change over time
  4. 13. French military and political leader
  5. 14. Study of the mind and behavior
  6. 16. Global computer network connecting millions of devices
  7. 17. Earth's natural satellite
  8. 18. Famous playwright and poet
Down
  1. 1. Period of cultural and artistic rebirth in Europe
  2. 3. Third planet from the Sun
  3. 5. Influential classical composer
  4. 6. Genetic material that carries hereditary information
  5. 7. Force that attracts objects toward each other
  6. 9. Mountain that erupts with lava and ash
  7. 10. Process by which plants convert sunlight into energy
  8. 11. Physicist known for the theory of relativity
  9. 12. Sculpture representing a person or object
  10. 15. System Sun and all the celestial objects orbiting around it