Across
- 3. a form of hydropower that converts the energy of tides into useful forms of power
- 4. resources that are not sustainable because their formation takes billions of years.
- 6. pollutants that have an identifiable origin
- 8. materials or substances such as minerals, forests, water, and fertile land that occur in nature
- 10. a panel designed to absorb the sun's rays as a source of energy for generating electricity or heating.
- 12. waves emitted by the sun
- 13. the production of electrical power through the use of the gravitational force of falling or flowing water.
- 14. the harvesting of the earths underground heat for power.
- 17. resources that are sustainable because their formations don't takes billions of years.
- 19. a gradual increase in the overall temperature of the earth's atmosphere generally attributed to the greenhouse effect caused by increased levels of carbon dioxide
Down
- 1. power obtained by harnessing the energy of the wind.
- 2. a natural fuel such as coal or gas, formed in the geological past from the remains of living organisms and take billions of years to replenish
- 4. pollutants that have no specific origin
- 5. electric or motive power generated by a nuclear reactor.
- 7. flammable gas occurring naturally underground and used as fuel.
- 9. power obtained by harnessing the energy of the sun's rays.
- 11. a gas that contributes to the greenhouse effect by absorbing infrared radiation
- 15. a turbine having a large vaned wheel rotated by the wind to generate electricity.
- 16. convert a recyclable materials into something else
- 18. preservation, protection, or restoration of the natural environment, natural ecosystems, vegetation, and wildlife