Across
- 3. such as wood or solar energy; also called renewable energy
- 4. free-falling water to electricity
- 10. 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.
- 12. resources, and thereby supporting long-term ecological balance
- 13. a natural fuel such as coal or gas, formed in the geological
- 14. or harm the environment, especially by avoiding the use of fossil fuels and nuclear power
- 15. - a natural resource that cannot be readily replaced
- 18. a resource of economic value that cannot be readily replaced
- 23. can be used over and over, but must go through a process to
- 24. - the process of injecting liquid at high pressure into
- 25. fissures and extract oil or gas
- 26. by natural means at a pace quick enough
- 28. with current technology at current prices. Typically much smaller than the resource.
- 30. cutting, or blasting.
Down
- 1. make full use of and derive benefit from (a resource)
- 2. any natural resource that can replenish itself naturally over
- 4. large strips of land are excavated in order to extract materials
- 5. subsurface tunneling
- 6. oil, natural gas and coal
- 7. - a kind of air pollution, originally named for the mixture of
- 8. from the remains of living organisms
- 9. rocks, boreholes, etc. so as to force open
- 10. the quality of not being harmful to the environment or depleting
- 11. it for re-use
- 16. - a natural resource that can be replenished (renewable) by
- 17. An open excavation or pit from which stone is obtained by
- 19. means such as solar, wind, geothermal, HEP
- 20. the amount of a substance which can be extracted from the
- 21. natural means on a level equal to consumption
- 22. keep up with consumption.
- 27. energy generated in ways that do not deplete natural
- 29. – HydroElectric Power; a form of energy generated by the conversion