Across
- 2. energy obtained from the interaction of sunlight with photovoltaic cells
- 5. precipitation that contains a higher than usual concentration of sulfuric and nitric acids
- 8. the lowering of the pH of the ocean caused by increased levels of carbon dioxide
- 9. energy obtained from the spinning of wind turbines that is converted to usable forms
- 10. air pollution resulting from the combination of gases produced by burning fossil fuels
Down
- 1. energy obtained from heat stored in the earth that is converted to a usable form
- 3. a colorless gas produced by decomposing landfill waste and animal food digestion
- 4. the process of removing small solid particles, like dust, from air
- 6. a colorless and odorless gas produced from the decay of radium
- 7. devices that use a liquid spray to remove pollutants from the air