Teacher told me to make a crossword puzzle puzzle

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Across
  1. 2. recently declared no longer a planet
  2. 4. a rover is exploring this planet
  3. 5. worlds largest animal
  4. 9. largest planet
  5. 11. city that sunk into the ocean
  6. 13. sweets with sugars
  7. 15. poorest continent
  8. 16. a huge test in Michigan
  9. 19. person who figured out my password
  10. 20. not having much money
Down
  1. 1. horse like animal
  2. 3. largest land mammal
  3. 4. nearest planet to the sun
  4. 6. lots of happiness
  5. 7. only planet with life
  6. 8. hottest planet in the solar system
  7. 10. person who also knows my password
  8. 12. one of the most advanced country's
  9. 14. no longer exists
  10. 17. you spend 7 hours a day here as a kid
  11. 18. dead non flying bird