Across
- 4. Plant-based material used as fuel
- 5. Energy that an object or particle has by reason of it's motion
- 7. Process by which heat is transferred by movement of a heated fluid such as air or water
- 8. Energy changing forms
- 11. Using the same item more than once
- 12. Black sedimentary rock with a lot of carbon and hydrocarbons
- 13. Energy not in motion; stored energy
- 14. Natural fuel such as coal or gas formed from remains of prehistorical living organisms
- 15. Strength and ability required for physical or mental activity
Down
- 1. Energy that is transferred through electromagnetic radiation
- 2. The act of saving resources
- 3. Precipitation with low pH levels
- 6. The process by which heat energy is transmitted through collisions between neighboring atoms or molecules
- 9. Collection of used items so they can be renewed and used for other purposes
- 10. Star at the center of the solar system