The Ultimate General Knowledge Challenge

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Across
  1. 4. Fastest land animal
  2. 10. Longest river in the world
  3. 12. Largest mammal on Earth
  4. 14. Device used to view distant stars
  5. 16. Precious gemstone commonly red in color
  6. 19. Main ingredient in guacamole
  7. 20. Hardest natural substance
  8. 23. Device used to determine direction
  9. 26. National sport of Japan
  10. 27. Shape with six sides
  11. 29. Scientist associated with the theory of relativity
Down
  1. 1. Tallest mountain above sea level
  2. 2. Instrument with eighty-eight keys
  3. 3. Author of Romeo and Juliet
  4. 5. Gas essential for human respiration
  5. 6. Largest planet in our solar system
  6. 7. Branch of science that studies living organisms
  7. 8. Number of continents on Earth
  8. 9. Organ that pumps blood through the body
  9. 11. Animal known as the king of the jungle
  10. 13. Seven-day period
  11. 15. Largest desert in the world
  12. 17. Largest ocean on Earth
  13. 18. Chemical symbol for gold
  14. 21. Planet known as the Red Planet
  15. 22. Ancient Egyptian writing system
  16. 24. Capital city of France
  17. 25. Opposite of north
  18. 28. Currency of Japan
  19. 30. Frozen water