Across
- 8. organic material that comes from plants and animals.
- 9. a cell producing an electric current directly from a chemical reaction.
- 10. the use of the sun's energy directly for either heating or cooling purposes.
- 11. energy generated in ways that do not deplete natural resources or harm the environment, especially by avoiding the use of fossil fuels and nuclear power.
Down
- 1. a form of renewable energy that uses the power of moving water to generate electricity.
- 2. prevention of the wasteful use of energy, especially in order to ensure its continuing availability
- 3. use of less energy to perform the same task or produce the same result.
- 4. a process or technology for producing energy by harnessing the temperature differences.
- 5. use of solar energy to heat a fluid -- either liquid or air -- and then transfer the solar heat directly to the interior space or to a storage system for later use.
- 6. type of renewable energy taken from the Earth's core.
- 7. energy from a source that is not depleted when used, such as wind or solar power.