Unit 8 Vocabulary

2. outbreaks of previously unknown diseases
5. tide an event that occurs on the coastline when algae—a plant-like organism—grows out of control
6. the process by which vegetation in drylands i.e. arid and semi-arid lands
7. air pollution that reduces visibility
11. the process of increasing the salt content in soil
13. is the practice of aerating the soil to permit moisture and air to permeate
14. the watering of land to make it ready for agriculture
15. occurs when plants are exposed to intensive grazing for extended periods of time, or without sufficient recovery periods
17. fuel energy source formed in the Earth's crust from decayed organic material
18. Protocol designed to stop the production and import of ozone depleting substances
20. a rapid increase in the density of algae in an aquatic system
21. an air pollutant emitted directly from a source
24. the rise or increase in the contaminated substances caused by the intoxicating environment
25. consists of a septic tank and a drainfield (or soil absorption field)

1. chemical compounds that are used to kill pests
3. a disease caused by a pathogenic organism
4. a sloping piece of land that has had flat areas like steps built on it
8. are linear plantings of multiple rows of trees or shrubs established for environmental purposes
9. the introduction of harmful materials into the environment
10. he gradual accumulation of substances, such as pesticides or other chemicals, in an organism
12. a region of exceptionally depleted ozone in the stratosphere
16. water that has been used in washing, flushing, manufacturing, etc.; sewage.
19. eutrophication a process that occurs when human water pollution speeds up by introducing sewage and other sources of nutrients in an aquatic ecosystem.
22. the practice of growing crops or raising animals
23. the process by which vegetation in drylands i.e. arid and semi-arid lands