Across
- 4. a natural substance that is not replenished with the speed at which it is consumed
- 6. pollution that comes from multiple sources
- 8. wastewater and excrement from underground drainage
- 10. the process by which fertile land becomes dry and infertile
- 14. growth whose rate becomes ever more rapid in proportion to the growing total number or size
- 15. the action of clearing a wide area of trees
- 17. the production and discharge of something, especially gas or radiation
- 18. particulate matter that is carried by water or wind and deposited on the surface of the land or the bottom of a body of water
- 19. rain or any other form of precipitation that has an unusual pH below 7
- 20. a resource of which there is an endless supply because it can be replenished
Down
- 1. any single identifiable source of pollution
- 2. the presence in or introduction into the environment of a substance or thing that has harmful or poisonous effects
- 3. the process of being worn away by wind or water or other natural agents or the gradual destruction or diminution of something
- 5. a colorless unstable toxic gas with a pungent odor and powerful oxidizing properties and formed from oxygen by electrical discharges or ultraviolet light
- 7. the condition of being populated with excessively large numbers
- 9. the number of live births per thousand of population per year
- 10. the ratio of deaths to the population of a particular area or during a particular period of time
- 11. the degradation of water quality by any process that changes water temperature
- 12. materials or substances such as minerals, forests, water, and fertile land that occur in nature and can be used for economic gain
- 13. a careful preservation and protection of something
- 16. able to be maintained at a certain rate or level