Stacy's crossword puzzle

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Across
  1. 5. 5 - 4 what type of equation is this?
  2. 8. a sphere that contains everything in life
  3. 10. the biggest planet in the solar system
  4. 12. the comparison of two numbers by division
  5. 14. The sun gives us ____ for us to stay up
  6. 17. good enough to live in
  7. 18. a sphere that makes matter and forms earth
  8. 19. the water sphere that we use to live
  9. 21. it has a numerator and a denominator
  10. 22. the horizontal axis in the coordinate plane
Down
  1. 1. a group of parts that interact
  2. 2. The bottom number of a fraction
  3. 3. some type of sphere we use to breath
  4. 4. 2 x 3 what type of equation is this?
  5. 6. The top number of a fraction
  6. 7. the first rocky planet on the solar system
  7. 9. Something that supports the claim
  8. 11. the planet we currently live on
  9. 13. Some green thing with big black eyes that must just be a cell
  10. 15. a round place in space
  11. 16. The second rocky planet in the solar system
  12. 20. the vertical axis in the coordinate plane