Pollution

3. to expose to danger; imperil.
4. the process by which sedimentary particles become separated according to some particular characteristic, as size or shape.
5. combustible matter used to maintain fire, as coal, wood, oil, or gas, in order to create heat or power.
8. To alter or adapt for new use without changing the essential form or nature.
9. capable of decaying through the action of living organisms.
11. a system formed by the interaction of a community of organisms with their environment.
13. a source of supply, support, or aid, especially one that can be readily drawn upon when needed.
14. the material world, especially as surrounding humankind and existing independently of human activities.

1. the branch of biology dealing with the relations and interactions between organisms and their environment, including other organisms.
2. not clean; dirty.
6. a building, room, or area, usually chiefly of glass, in which the temperature is maintained within a desired range, used for cultivating tender plants or growing plants out of season.
7. the act of contaminating, or of making something impure or unsuitable by contact with something unclean, bad.
10. the aggregate of surrounding things, conditions, or influences; surroundings.
12. any smokelike or vaporous exhalation from matter or substances, especially of an odorous or harmful nature.
13. worthless, unwanted material that is rejected or thrown out; debris; litter; trash.