Stacy's crossword puzzle

1234567891011121314151617181920
Across
  1. 4. 2 x 3 what is this equation
  2. 6. The sun gives us ____ for us to stay up
  3. 7. a sphere that makes matter and forms earth
  4. 8. The top number of a fraction
  5. 12. the vertical axis in the coordinate plane
  6. 15. the planet we currently live on
  7. 16. good enough to live in
  8. 17. the comparison of two numbers by division
  9. 19. The second rocky planet in the solar system
  10. 20. The bottom number of a fraction
Down
  1. 1. it has a numerator and a denominator
  2. 2. a sphere that contains everything in life
  3. 3. a round place in space
  4. 4. the first rocky planet on the solar system
  5. 5. the water sphere that we use to live
  6. 9. some type of sphere we use to breath
  7. 10. 5 - 4 what is this equation
  8. 11. the biggest planet in the solar system
  9. 13. the horizontal axis in the coordinate plane
  10. 14. Some green thing with big black eyes that must just be a cell
  11. 15. Something that supports the claim
  12. 18. a group of parts that interact