Earth Day 11-B

2. a system of trash and garbage disposal in which the waste is buried.
5. management of a natural resource to prevent exploitation.
7. material that is considered unimportant or valueless.
8. the production and discharge of something.
11. relating to or derived from living matter.
12. the envelope of gases surrounding the earth or another planet.
14. organic material used as a fertilizer.
16. the study of organisms and how they interact with the environment around them.
17. he natural home or environment of an organism.
18. “old” products get to be modified and get a second life as they're turned into a “new” product.

1. contaminate with harmful or poisonous substances.
3. the surroundings or conditions in which a living thing operates.
4. the complete disappearance of a species from Earth.
6. capable of being renewed.
9. able to be maintained at a certain rate or level.
10. convert waste into reusable material.
11. an odorless, colorless gas made up of three oxygen molecules (O3) and is a natural part of the environment
13. a complex network or interconnected system.
15. relating to or determined by the sun.