CHAPTER 3 REVIEW CROSSWORD

1. the zone around earth where life can exist.
4. the series of processes that cycle water through the enviroment.
5. the gradual and usually precdictable changes of abiotic factors in an ecosystem.
6. a species that is likely to become endangered if factors reducing its survival are not changed.
8. the movement of matter through the biotic and the abiotic enviroment.
10. precipitation that is more acidic than usual because of chemicals in the air and water vapour.
14. the number of species in an area.
16. all of earth's water in solid, liquid and gas form.
18. a species that may become threatned or endangered because of a combination of factors.
19. a non-native species whose intentional or accidental introduction negatively impacts the natural enviroment.
24. refers to a species that has died out and no longer occurs on earth.
25. taking responsibility for managing and protecting the enviroment.

2. harmful contaminants realeased into the enviroment.
3. Earth's solid outer layer.
7. succession on newly exposed ground, such as following a volcanic eruption.
9. a speies facing imminent extripation or extinction.
11. the layer of gases surrounding earth.
12. the variety of life in a particular ecosyste; also known as bilogical diversity.
13. a large geographical region defined by climate with a specific of biotic and abiotic factors.
15. the biogeochemical cycle in which carbon is cycled through all earth's atmosphere.
17. a cutting method where they pick and choose which trees they want to cut judging by there age and maturity.
20. describes the state of an ecosystem wuth relatively constant conditions over a period of time.
21. people who engage in enviromentally responsible travel to undisturbed natural areas.
22. a species that no longer exists in a specific area.
23. a method of cutting where they cut down all trees in a specific area.