Known and unknown Science Facts

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Across
  1. 3. where is the oldest living tree located
  2. 4. Which animal have 3 hearts
  3. 8. breath through their butts
  4. 9. Oldest profession in the world
  5. 10. World largest amphibian
  6. 12. Home video games developed first
  7. 13. how many countries competed in 2018 winter olympics
  8. 16. where is the world largest bridge located
  9. 17. male species give birth to young one
Down
  1. 1. Most earthquake country
  2. 2. Hardest natural substance
  3. 5. Youngest country in the world
  4. 6. where is the largest particle accelerator located
  5. 7. Capable to express over 100 vocal sounds
  6. 10. strongest natural material
  7. 11. First scientist awarded with two noble prizes
  8. 14. Hottest planet in our solar system
  9. 15. More islands than any other countries