Across
- 2. trash left lying in an open or public place
- 4. the whole mass of air surrounding the Earth
- 7. able to be maintained at a certain rate or level
- 9. contaminate with harmful or poisonous substances
- 10. surroundings in wich life exists on Earth
Down
- 1. decayed organic material used as plant fertilizer
- 3. a community of living organisms
- 5. releasing something from a source, such as gas, heat, light, or particals
- 6. Power from the suns radiation
- 8. a place to dispose or refuse and other waste material