General knowledge crossword

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Across
  1. 2. Which element has the chemical symbol 'Au'
  2. 6. Which part of the brain controls movement and balance?
  3. 10. What is the name of the galaxy that contains Earth?
  4. 12. Who painted the Mona Lisa?
  5. 14. What gas do plants absorb from the atmosphere?
  6. 16. What is the name of the process by which plants make food?
  7. 18. What is the currency of Japan?
  8. 19. What is the capital of Canada?
Down
  1. 1. Which Romance language is the official language of Brazil?
  2. 3. What is the hardest natural substance on Earth?
  3. 4. Which planet in our solar system has the shortest day?
  4. 5. Who discovered penicillin?
  5. 7. What is the name of the Roman god of war?
  6. 8. Which Shakespeare play features the line: “Is this a dagger which I see before me, the handle toward my hand?”
  7. 9. What is the term for animals that eat only plants?
  8. 11. What is the name of Sherlock Holmes’ assistant?
  9. 13. Which European river flows through four capital cities?
  10. 15. Which Greek god is associated with the sun and music?
  11. 17. What is the smallest prime number?
  12. 20. What is the name of the ship that sank in 1912?