Across
- 3. A cell producing an electric current directly from a chemical reaction
- 7. A plant-based material used as fuel
- 9. Energy collected from renewable resources
- 10. Energy generated in ways that do not deplete natural resources or harm the environment
- 11. A colorless volatile flammable liquid that is produced by the natural fermentation of sugars
- 12. An electrical device that converts the energy of light directly into electricity
- 13. The goal to reduce the amount of energy
- 15. The generation of electricity and other energy jointly
- 17. Uses the ocean thermal gradient to produce energy
Down
- 1. The prevention of the wasteful use of energy or the principle by which the total energy remains constant in a system that is not subject to external influence
- 2. Electricity produced from hydropower
- 4. The use of the sun's energy directly for heating or cooling purposes
- 5. The use of the sun's energy either as heat or electricty to augment heating systems
- 6. A form of power produced by the natural rise and fall of tides
- 8. The thermal energy in the Earth's crust
- 14. An area of land with a group of energy-producing windmills or wind turbines
- 16. A colorless, odorless flammable gas