Across
- 3. energy transferred from vibrating objects
- 4. a reference line
- 5. a force on moving objects
- 6. the rise and fall of the sea
- 8. a straight lines in which light travels
- 10. the highness or lowness of a sound
- 11. a path
- 13. liquid rock below surface of the Earth
- 14. a component to change chemical to electrical energy
- 16. unit of energy
Down
- 1. to allow current to flow
- 2. the force that pulls masses towards each other
- 7. reflection of sound
- 9. force that hold particles together
- 12. to measure current
- 15. a substance that provide heat