Across
- 4. fuel The cheapest and most convenient source of energy
- 7. natural gas is non renewable
- 9. heat that is transferred by touch
- 12. energy that is extracted from the earths surface
- 14. wind energy is the most used energy source
- 15. heat that is transferred by waves
Down
- 1. energy that comes from burning organic matter
- 2. does hot air fall down or rise up
- 3. energy that comes from the sun
- 5. energy from the natural flow of water
- 6. what does everything above absolute zero emit
- 8. heat that is transferred by air or wind
- 10. energy that comes from fission
- 11. energy energy that uses wind to spin a turbine
- 13. true or false is solar energy a source of renewable energy