Across
- 2. a specific source of pollution that can be identified
- 5. liquid fossil fuel; oil
- 7. electricity produced by the kinetic energy of water moving over a waterfall or dam
- 9. coal, oil, or natural gas that forms over millions of years from the remains of ancient organisms
- 11. a resource that is either always available or is naturally replaced in a relatively short time
- 13. the process by which two atomic nuclei combine to form a larger nucleus, forming a heavier element and releasing huge amounts of energy
- 14. energy from the sun
Down
- 1. a widely spread source of pollution that is difficult to link to a specific point of origin
- 3. the percentage of input work that is converted to output work
- 4. anything naturally occuring in the environment that humans use
- 6. the intense heat energy that comes from Earth's interior
- 8. a substance that provides energy as the result of a chemical result
- 10. contamination of Earth's land, water, or air
- 12. fuel made from living things
- 13. a natural resource that is not replaced in a useful time frame