environmental systems

1. a community of living organisms in conjunction with the nonliving components of their environment
8. waste that has substantial or potential threats to public health or the environment
9. a collection of plants and animals that have common characteristics for the environment they exist in
11. any single identifiable source of pollution from which pollutants are discharged
12. he introduction of contaminants into the natural environment that cause adverse change
14. precipitation that is unusually acidic
16. the variety and variability of life on Earth
19. the action or process of adapting
20. the practice of protecting the natural environment by individuals, organizations and governments
21. the combined mass of water found on, under, and above the surface of a planet
23. any non living component
24. a species is indigenous to a given region or ecosystem
25. prevention of wasteful use of a resource

2. the ability to exist constantly
3. a system of interlocking and interdependent food chains
4. a type of wastewater
5. the process by which fertile land becomes desert
6. the long-term average of weather
7. the action of surface processes that removes soil, rock, or dissolved material from one location on the Earth's crust
10. the match of a species to a specific environmental condition
13. the number of different habitats that one particular region can provide
15. any living component
17. an enlarged natural or artificial lake, pond, or impoundment created using a dam or lock to store water
18. an introduced organism that negatively alters its new environment
22. a substance used for destroying insects or other organisms