| 2. toxic substances used to eliminate pests | 1. removal of stale air |
| 4. reduction of pollution | 3. chronic inflammatory disease that affects the airways |
| 8. mineral fiber that was used to construct buildings | 5. pollutants given off into the atmosphere |
| 9. burning accompanied by the release of energy | 6. naturally occurring radioactive gas |
| 10. adverse impact on the environment | 7. amount of water vapor in the air |
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| February 10, 2006 | | Disclaimer/Policy |