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| 1.
These propellants once found in aerosol cans are thought to be harmful to the ozone layer. |
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| 2.
Speaking of the ozone layer, what harmful product does this part of the atmosphere filter? |
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| 3.
What four letter word that is a combination of smoke and fog is used to describe many forms of air pollution? |
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| 4.
What is the result when industrial chemicals combine with condensing water vapor? |
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| 5.
What city is generally considered to have America's worst air pollution problem? |
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| 6.
What Mexican city is considered to be the world's worst for air pollution? |
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| 7.
What is visible air pollution called? |
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| 8.
What is the main source of water pollution in unindustrialized nations? |
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| 9.
What oil tanker created a major water problem around Alaska? |
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| 10.
The evaporation of irrigation water leaves salt in soil producing what type of soil pollution? |
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