Science

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Across
  1. 1. the back and forth motion of an object
  2. 4. allowing some light through material
  3. 6. stored energy
  4. 9. the ability to do work
  5. 10. transparent
  6. 11. speed in a given direction
  7. 14. bouncing of light
  8. 16. a force that acts at a distance
  9. 18. an imaginary line around which earth rotates
Down
  1. 2. the tendency of an object to resist any change in motion
  2. 3. opaque
  3. 5. organism that cannot make its own food
  4. 7. more change in motion
  5. 8. bending of light
  6. 12. translucent
  7. 13. allowing nearly all light through material
  8. 15. a large, round object that revolves around the sun but has not cleared the region around its orbit
  9. 17. allowing zero light through material