Across
- 4. Pollutants that are released into the air.
- 6. Contamination of Earth's land, water, or air.
- 7. A natural resource that is not replaced in a useful time frame.
- 8. Energy-rich substance formed from the remains of organisms.
- 9. The removal of forests to use land for other reasons.
- 10. A natural resource that is almost always availible and doesn't run out.
Down
- 1. The advance of desert-like conditions into areas that were previously fertile.
- 2. The process by which water, ice, wind, or gravity moves weathered particles of rock and soil.
- 3. Anything naturally occuring in the enviornment humans use.
- 5. A condition when the number of humans is more than availible resources.