6th grade overall science review

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Across
  1. 4. Which planet has the most stars
  2. 5. The study of the universe
  3. 8. Sound and light travel in ______
  4. 10. What is the bottom of a Compressional wave
  5. 11. What wave has sound energy
  6. 12. What is a third-class lever
Down
  1. 1. What type of electricity is lightning
  2. 2. What is an example second-class
  3. 3. What is the top of a Compressional wave
  4. 6. What huge clump of gas creates stars
  5. 7. What wave has light energy
  6. 9. What type of galaxy is the Milky Way
  7. 13. What is an example of a first-class lever