Extremely Hard Puzzle (Trust Me)

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Across
  1. 2. Which is the strongest human bone?
  2. 4. What weather tool is used to measure air pressure?
  3. 7. What type of Pokemon is Pikachu?
  4. 8. What is the plural of moose?
  5. 9. Which Simpsons character wears an orange dress?
  6. 11. The species that can live on land and water.
  7. 14. What is the hardest natural mineral?
  8. 18. What is the capital of Denmark?
  9. 19. Which is the largest and deepest ocean in the world?
  10. 20. Greece is in which continent?
Down
  1. 1. What force resists motion between two objects?
  2. 3. Last name of the person who discovered and named the force of gravity in 1665?
  3. 5. in which continent is the largest desert?
  4. 6. Which is the largest country in the world?
  5. 10. What is the sixth largest country in the world?
  6. 12. What is the fastest human sense?
  7. 13. What is the currency in the UK?
  8. 15. Which gas is necessary for breathing?
  9. 16. What is the center of a cell called?
  10. 17. What is the capitol of France?