Across
- 4. energy formed from the power of water in motion.
- 7. energy source energy transformed state.
- 8. using or disposing of materials.
- 10. process of growing or being stable
- 11. naturally occurring fossil fuel as gas.
- 14. process of harming the environment.
Down
- 1. an energy source that can be easily replenished.
- 2. coal, petroleum, natural gas, and oil.
- 3. wind-solar, hydroelectric, tidal, and geothermal energy.
- 5. liquid derived from petroleum
- 6. rock found underground used as a fuel.
- 9. extended period or without interruption
- 12. the process of obtaining coal or other minerals.
- 13. ability to do work in the sense of heating, moving, etc.
- 14. energy source energy forms that can be used as they appear in nature.