General

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Across
  1. 1. King Arthur's legendary sword
  2. 8. A type of energy that comes from the sun
  3. 11. The study of celestial bodies and the universe
  4. 13. The process by which plants make their own food
  5. 14. Basic unit of life
  6. 15. Famous playwright of Romeo and Juliet
  7. 17. A famous scientist who formulated the theory of relativity
  8. 19. The capital of Japan
  9. 20. Small, buzzing insect that produces honey
Down
  1. 2. A reptile known for changing color to match its surroundings
  2. 3. Fastest land animal
  3. 4. The force that pulls objects toward the center of the Earth
  4. 5. Earth's natural satellite
  5. 6. System of government by the people
  6. 7. A planet known as the Red Planet
  7. 9. A shape with eight sides
  8. 10. Cold, frozen water
  9. 12. Largest mammal on Earth
  10. 16. Capital of France
  11. 18. An element with the symbol "Fe"