Earth Day 2013

2. the place or type of place where a plant or animal naturally or normally lives or grows
3. a mixture largely of decayed matter of once living things, or their products and used for fertilizing and conditioning land
5. caused by the sun
7. the whole mass of air surrounding the earth
10. an act or instance of emitting
12. trash, wastepaper, or garbage lying scattered about
13. the surrounding conditions or forces that influence or modify
15. pertaining to a class of chemical compounds that formerly comprised only those existing from plants or animals
17. to make impure; especially with waste made by humans

1. no longer existing
4. to be kept for future use
5. to give support or relief to
6. a system of trash and garbage disposal in which the waste is buried between layers of earth
8. layer a layer of the earth's atmosphere at heights of about 20 to 30 miles that is normally characterized by high ozone content which blocks most of the sun's ultraviolet radiation from entry into the lower atmosphere
9. to process in order to regain materials for human use
11. to keep in a safe or sound state
13. a community of organisms and its environment functioning as an ecological unit
14. capable of being renewed
16. a branch of science concerned with the relationships between living things and their environment