Across
- 3. the introduction of harmful materials into the environment
- 4. chemical compounds that are used to kill pests
- 6. the process by which vegetation in drylands i.e. arid and semi-arid lands
- 7. the practice of growing crops or raising animals
- 8. . Fossil fuels are made from decomposing plants and animals.
- 11. are linear plantings of multiple rows of trees or shrubs established for environmental purposes
- 15. a rapid increase in the density of algae in an aquatic system
- 17. Protocol designed to stop the production and import of ozone depleting substances
- 18. a sloping piece of land that has had flat areas like steps built on it
- 19. the process by which vegetation in drylands i.e. arid and semi-arid lands
- 20. is the practice of aerating the soil to permit moisture and air to permeate
- 22. water that has been used in washing, flushing, manufacturing, etc.; sewage.
- 23. fuel energy source formed in the Earth's crust from decayed organic material
- 24. air pollution that reduces visibility
Down
- 1. the rise or increase in the contaminated substances caused by the intoxicating environment
- 2. consists of a septic tank and a drainfield (or soil absorption field)
- 3. an air pollutant emitted directly from a source
- 5. eutrophication a process that occurs when human water pollution speeds up by introducing sewage and other sources of nutrients in an aquatic ecosystem.
- 9. the watering of land to make it ready for agriculture
- 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
- 13. the process of increasing the salt content in soil
- 14. occurs when plants are exposed to intensive grazing for extended periods of time, or without sufficient recovery periods
- 16. outbreaks of previously unknown diseases
- 21. tide an event that occurs on the coastline when algae—a plant-like organism—grows out of control