Across
- 4. How loud or soft a sound is.
- 5. How often a wave happens; it affects pitch.
- 7. A huge group of stars, planets, and gas held together by gravity.
- 8. The planet we live on.
- 11. An imaginary line an object spins around.
- 12. The height of a wave; it affects loudness.
- 13. The path an object follows around another object.
- 16. Half of a sphere, like half of Earth.
- 18. The largest planet in our solar system.
- 19. A natural object that orbits a planet.
- 20. Harm or injury to something.
Down
- 1. wave A vibration that travels and can be heard.
- 2. A magnet made using electricity.
- 3. A push or a pull.
- 6. Energy an object has because it is moving.
- 9. When two objects hit each other.
- 10. A fast back-and-forth movement.
- 14. To move in a path around something else.
- 15. The material sound travels through (like air or water).
- 17. How high or low a sound is.