Oh whats that SOUND

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Across
  1. 3. Which element has the atomic number 8?
  2. 6. Who composed the Ninth Symphony?
  3. 11. What is the capital of Canada?
  4. 13. What geological feature is measured using the VEI
  5. 15. Who composed “The Magic Flute”?
  6. 18. Which philosopher wrote “The Republic”?
  7. 19. Who improved the telescope and supported heliocentrism?
  8. 20. Which planet is furthest from the sun?
  9. 23. Which planet is known as Earth’s twin?
  10. 25. Which artist painted “Guernica”?
  11. 27. What is the longest continental mountain range?
  12. 29. Which planet is the largest in our solar system?
  13. 30. Which is the smallest planet in our solar system?
  14. 31. Who proposed the theory of natural selection?
  15. 32. Which mathematician is associated with the famous number sequence starting 0, 1, 1, 2, 3?
Down
  1. 1. Which city is known as the Eternal City?
  2. 2. Which Japanese city was the imperial capital for over 1,000 years?
  3. 4. What is the capital of Iceland?
  4. 5. What term refers to the complete set of genetic material in an organism?
  5. 7. What is the most abundant element in the universe?
  6. 8. Which river has the greatest discharge of water
  7. 9. Which country has the second largest population in the world?
  8. 10. What is the largest rainforest in the world?
  9. 12. Which mountain range runs through Switzerland and Austria?
  10. 14. Which inventor is associated with alternating current?
  11. 16. Who wrote “The Lord of the Rings”?
  12. 17. Who wrote “The Tempest”?
  13. 21. What is the fourth state of matter?
  14. 22. Who invented the practical electric light bulb?
  15. 24. Which sea lies between Sweden and Latvia?
  16. 26. Who formulated the laws of motion and universal gravitation?
  17. 28. Which planet rotates on its side?