Random General Knowledge (ver.2)

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Across
  1. 1. planet that is known as the "Red Planet"?
  2. 5. What is the primary language spoken in Brazil?
  3. 8. Which gas do plants absorb from the atmosphere for photosynthesis?
  4. 9. Which element is said to keep bones strong?
  5. 10. What is the official currency of the United Kingdom?
  6. 14. Through which country does the Amazon River primarily flow?
  7. 15. Which element is the most abundant in the Earth's atmosphere?
  8. 16. How many strings does a standard guitar have?
  9. 17. Which planet is closest to the Sun?
  10. 18. Which element is said to keep bones strong?
Down
  1. 1. What is the smallest planet in our solar system?
  2. 2. How many chambers does the human heart have?
  3. 3. Which planet is the largest in our solar system?
  4. 4. What is the freezing point of water in Celsius?
  5. 6. What is the capital city of South Korea?
  6. 7. what is the fastest bird in the world?
  7. 11. How many hearts does an octopus have?
  8. 12. What force keeps objects bound to the Earth?
  9. 13. Which vitamin is primarily produced when the human skin is exposed to sunlight?
  10. 15. the longest river in the world?