Across
- 4. resource: biomass energy (such as ethanol), hydropower, geothermal power, wind energy, and solar energy
- 7. a deposit in Earth's crust of one or more valuable minerals
- 8. energy: a form of energy released from the nucleus, the core of atoms, made up of protons and neutrons
- 9. the act of returning something to a former, better state
- 10. precipitation: any form of precipitation with acidic components, such as sulfuric or nitric acid that fall to the ground from the atmosphere in wet or dry forms
- 11. smog: a mixture of pollutants that are formed when nitrogen oxides and volatile organic compounds (VOCs) react to sunlight, creating a brown haze above cities
- 12. energy: any type of energy generated by the sun
- 13. farm: an area of land with a cluster of wind turbines for driving electrical generators
Down
- 1. resource: sources that will run out or will not be replenished in our lifetimes
- 2. the purposeful clearing of forested land
- 3. energy: heat energy from the earth
- 5. energy:energy generated or produced by living or once-living organisms
- 6. power: a form of energy that harnesses the power of water in motion—such as water flowing over a waterfall—to generate electricity