Across
- 2. a system that captures sunlight within the buildings materials and then release that heat during periods when the sun is absent.
- 5. a system using solar energy to heat a fluid and transferring the solar heat directly
- 6. a process or technology for producing energy by harnessing the temperature differences between the ocean.
- 8. energy generated in ways that do not deplete natural resources.
- 9. a form of energy that harnesses the power of water in motion to generate electricity.
- 12. an area of land with a group of energy-producing windmills.
- 14. any organic material which is deliberatly burned by humans for energy.
- 15. the decision and practice of producing less energy.
- 16. a colorless, odorless gas.
- 17. a colorless volatile flammable liquid.
Down
- 1. a form of energy that is formed by using heat from the Earth.
- 3. a energy from a source that is not depleted used.
- 4. a specialized semiconductor that converts visible light into energy.
- 7. the generation of electricity and other energy jointly.
- 10. the use of less energy to perform the same task or produce the same result.
- 11. a form of power produced by the natural rise and fall of tides.
- 13. any substance that can provide heat and produce energy when it is burned.