Across
- 3. energy by the use of wind turbines to generate electricity.
- 4. 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
- 5. make full use of and derive benefit from (a resource)
- 6. a natural resource that cannot be readily replaced (nonrenewable) by natural means at a pace quick enough to keep up with consumption.
- 7. any natural resource that can replenish itself naturally over time, such as wood or solar energy; also called renewable energy
- 10. a natural fuel such as coal, oil, or gas, formed in the geological past from the remains of living organisms
- 11. An open excavation or pit from which stone is obtained by digging, cutting, or blasting.
- 13. a kind of air pollution, originally named for the mixture of smoke and fog in the air. Classic smog results from large amounts of coal burning in an area and is caused by a mixture of smoke and sulfur dioxide. ... Smog is a problem in a number of cities and continues to harm human health.
- 15. a resource of economic value that cannot be readily replaced by natural means on a level equal to consumption. Example: oil, natural gas and coal
- 16. the quality of not being harmful to the environment or depleting natural resources, and thereby supporting long-term ecological balance
- 17. form of energy produced by the natural rise and fall of tides.
- 18. HydroElectric Power; a form of energy generated by the conversion of free-falling water to electricity
- 19. a resource that can be used over and over, but must go through a process to prepare it for re-use
Down
- 1. a natural resource that can be replenished (renewable) by natural means such as solar, wind, geothermal, HEP
- 2. large strips of land are excavated in order to extract materials without subsurface tunneling
- 6. the process of injecting liquid at high pressure into subterranean rocks, boreholes, etc. so as to force open existing fissures and extract oil or gas
- 8. heat energy from the earth- geo (earth) + thermal (heat) which originates from the formation of radioactive decay of material inside the earth. These underground reservoirs of steam and hot water can be tapped to generate electricity.
- 9. liquid fuels produced from renewable biological sources (biomass including wood, bioethanol and biogas from plants and algae)
- 12. the amount of a substance which can be extracted from the earth with current technology at current prices. Typically much smaller than the resource.
- 14. form of energy that converts sunlight into electrical energy either through photovoltaic (PV) panels or through mirrors that concentrate sunlight solar radiation.
- 15. the energy released by nuclear reactions in the nucleus of atoms such as uranium.