12. Nonrenewable Energy REVIEW
Across
- 6. turning these off saves energy (p177)
- 7. resources used up faster than they can be replaced (p168)
- 8. the US used far more of this than Western Europe in 2007 (p177)
- 9. petroleum is also called this oil (p170)
- 10. most common nuclear fuel element (p168)
- 11. a fossil fuel can be a solid liquid or this (p169)
- 14. petroleum and natural gas form from the remains of these organisms (p171)
- 18. nonrenewable resources must be used this way (p177)
- 19. coal is used mainly to produce this (p171)
- 20. fossil fuels and nuclear fuel are two main types of these resources (p168)
- 21. coal forms from the remains of ancient these (p172)
- 24. air pollution formed from burning fossil fuels (p175)
- 25. burning coal releases this dioxide causing acid rain (p175)
- 27. type of waste from nuclear fuel (p174)
- 29. fossil fuel burning adds this greenhouse gas (p175)
- 30. released when fossil fuels burn and used to generate electricity (p169)
- 31. natural gas is a mixture of these (p170)
Down
- 1. heat and pressure change buried organisms into natural gas and this (p172)
- 2. nuclear fuel produces a large amount of this energy (p174)
- 3. peat lignite bituminous then this hardest coal (p172)
- 4. natural gas is commonly used for this and cooking (p170)
- 5. fossil fuels are this to find and process (p169)
- 12. layers of this bury organisms to form fossil fuels (p171)
- 13. most US energy in the pie graph comes from these (p168)
- 14. fossil fuels form from organisms that lived this long ago (p168)
- 15. a natural material used to produce this (p168)
- 16. heated from nuclear plants can harm ecosystems (p174)
- 17. petroleum is refined into gasoline diesel and this (p170)
- 22. original source of energy stored in fossil fuels (p169)
- 23. process that splits the nucleus of an atom (p168)
- 26. uranium is used as fuel in nuclear these (p176)
- 28. fossil fuels form from plants and these organisms (p169)
- 32. petroleum and natural gas are removed using these wells (p170)