General science

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Across
  1. 4. speed with direction
  2. 8. eyeglasses
  3. 11. removal of waste
  4. 13. first element
  5. 16. plants prepare food
  6. 17. smallest unit of matter
  7. 18. energy from earth
  8. 20. our galaxy
Down
  1. 1. unit of force
  2. 2. disease on global scale
  3. 3. hottest planet
  4. 5. makes windmills turn
  5. 6. bending of light
  6. 7. thermometer
  7. 9. any kind of power
  8. 10. length of shortest path travelled by body
  9. 12. path of light energy
  10. 13. balloons filled with
  11. 14. produce CFC
  12. 15. plant science
  13. 19. biological mass