Science and math crossword puzzle

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Across
  1. 1. the best science teacher
  2. 3. used to keep our phones on
  3. 5. energy from the wind
  4. 10. Lower than 0
  5. 11. please excuse my dear aunt sally
  6. 13. The set of whole nummbers and their opposites
  7. 15. take away
  8. 16. form A number written with a base and an exponent
  9. 17. energy from a gasoline tank
  10. 20. Ge___________
Down
  1. 2. the opposite of a number
  2. 4. A half circle
  3. 6. explain your _____
  4. 7. The best subject
  5. 8. A set of points and the line segments or arcs that connect the points
  6. 9. Having the same value
  7. 12. The number of square units needed to cover a given surface
  8. 14. A bar graph that shows the frequency of data within equal intervals
  9. 18. kinetic ______
  10. 19. energy in motion