Third Grade Science Review

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Across
  1. 2. bones working together create this system
  2. 4. substance inside your bones
  3. 5. planet closest to the sun
  4. 9. the Milky Way is this type of galaxy
  5. 10. bouncing light
  6. 13. a thin protective covering on the surface of the eye
  7. 14. the movement of the Earth on its axis
  8. 15. an explanation of how or why something happened
  9. 17. this force keeps us anchored to Earth
  10. 18. the path that a planet follows around the sun
  11. 19. Sound vibrations travel through the air in _____.
  12. 21. animal that has hair or fur and breathes with lungs
Down
  1. 1. the movement of the Earth around the sun
  2. 3. Light can easily travel through ________ materials.
  3. 6. this animal is covered with plates or scales
  4. 7. a meteoroid that enters Earth's atmosphere and burns
  5. 8. the highness and lowness of sound
  6. 11. Light can only travel in ______ paths.
  7. 12. an animal that has a backbone
  8. 16. This joint is found in your knees.
  9. 20. Sounds travel best through _______.