Across
- 1. measure of the cloudiness of water that is caused by suspended solids.
- 5. removal of trees and other vegetation from an area.
- 9. resource any type of matter or energy from Earth’s environment that humans use to meet their needs; includes water, petroleum, minerals, forests, and animals.
- 10. behavior that leads to the protection, conservation and reclamation of natural resources.
- 12. growth of urban areas caused by people moving into cities.
- 14. resource - natural resource that humans use to make objects or to consume as food and drink.
- 15. pollution that comes from many different sources, such as industries, homes, and farms.
- 17. suitable for drinking.
- 18. pollution contamination of the atmosphere by the introduction of pollutants from human and natural sources.
- 19. artificial body of water that usually forms behind a dam.
Down
- 2. process by which human activities or climatic changes make areas more desert-like.
- 3. process of planting trees to reestablish forestland.
- 4. controlled use and/or maintenance of natural resources; the wise use and preservation of natural resources.
- 6. process by which a damaged land area is returned to nearly the condition it was in before people used it.
- 7. fuel nonrenewable energy resource that began to form millions of years ago from remains of once-living plants and animals; provides energy and includes coal, oil, and natural gas.
- 8. tiny particle or droplet, such as dust, dirt, or pollen that are mixed in with air.
- 11. symbol for the measure of the acidity or alkalinity of a solution.
- 13. process of recovering valuable or useful materials from waste or scrap.
- 16. pollution waste matter or other material that is introduced into water and that is harmful to organisms that live in, drink, or are exposed to the water.
- 20. combination of smoke and fog; air pollution that forms when ozone and vehicle exhaust react with sunlight.