Water and Air Test Review

1. The process of removing salt from saltwater
3. water falling from the sky in the form of rain, snow, sleet, or hail.
6. Two kinds of water are _________ and saltwater
7. Water that is safe to drink
9. The buildup of pollutants at higher levels of the food chain
12. The ___________ The ____________ is the continuous movement of water between Earth and its atmosphere.
16. method of providing plants with water from sources other than direct precipitation
19. When humans artificially cause an overabundance of nutrients in a system; often occurs with fertilizer runoff
20. An underground formation that contains groundwater
22. Pollution discharged from a single source
23. an air pollutant emitted directly from a source in its harmful form
24. the process where a liquid, like water, changes into a gas
25. The area of land that is drained by a river
26. __________ water usage accounts for 19% of water use in the world

2. When the temperature of a body of water increases decreasing the dissolved oxygen in the water
4. Organisms that cause illness or disease
5. a substance formed in the atmosphere through chemical reactions involving primary pollutants
8. the process where a gas changes into a liquid
10. Restore and maintain the chemical, physical, and biological integrity of the nation’s waters
11. Most of the freshwater used worldwide is used in _________
13. Which pollutant is produced by stoves, incinerators, and open burning
14. The ability of rock or soil to allow water to flow through it
15. Pollution discharged from many different sources that are often difficult to identify
17. An area of the Earth’s surface where water percolates (filters gradually) down into an aquifer
18. Most of the water humans can use is ___________
21. A flowing network of rivers and streams