Across
- 6. energy from the Sun
- 9. brownish haze produced when nitrogen compounds and other pollutants in the air react
- 10. has the chemical formula H20
- 11. Renewable energy
- 13. Fossil fuels such as coal,oil, and uranium
- 14. deposits of minerals large enough to be mined for profit
- 15. group of wind turbines that produce electricity
Down
- 1. cutting down trees for human activities
- 2. Stars release this kind of energy
- 3. energy produced by burning organic matter
- 4. electricity produced by flowing water
- 5. Process in which mined land must be recovered
- 7. thermal energy from Earth's interior
- 8. a viscous liquid derived from petroleum
- 12. precipitation that has a ph less than 5.6