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Science
Engineering
Civil Engineering
Unit 5: Pollutants
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Environmental Science B
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Lesson 21
Workbook 21.1
1. Which is an example of a nonpoint source of air pollution?
wildfires
2. A student learns that chlorofluorocarbons (CFCs) are harmful to the environment. Which of these explains the harmful effect of CFCs?
depletion of the ozone layer resulting in more UV rays reaching Earth's surface