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 | | One of the causes of acid rain is the burning of coal, oil and gas by heavy industry and electrical companies. |
 | | These acids in the atmosphere are carried down-wind and deposited on the earth's surface in snow, rain, and other precipitation, destroying animal life in some freshwater lakes, damaging forests and crops, eroding structures, and contaminating drinking water. |
 | | The greenhouse effect is a popular term of the role that various atmospheric components such as water vapor, carbon dioxide, and to a lesser extent, ozone, play in keeping the earth's surface warmer than it would be without their presence. |
| www.clas.ufl.edu /users/rhatch/NSF-PLANS/5-2_ENVIRSCI.htm (932 words) |
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