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| Most air pollution is caused by the burning of fossil fuels, either by industries or automobiles. |
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| * Acid precipitation is just a local problem and does not effect the environment globally. |
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| * The atmosphere consists of 5 thin layers of gas. |
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| * Climate is affected by lattitude, wind, ocean currents, and local geography |
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| * The process called tghe "Greenhouse Effect" keeps the Earth warm enough for life to exist. |
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| * Is using both sides of the paper an effective effort in conserving trees? |
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| * Fossil fueks are unlimited resources and are being used very slowly. |
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| The energy from the sun is known as solar energy. It is clean, safe, and renewable. |
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| * An electric generator is a device for converting electricity into mechanical energy. |
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| * The Endangered Species Act is designed to protect only animal species that are in danger of extinction. |
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| * While extinction is a natural event, humans are accelorating the rate of extinction worldwide. |
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| * Pests are often able to evolve resistance to pesticides. |
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| * Carbon, Water, and Nitrogen, are three materials that are essential for life. Each follows a recognizable cycle. |
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| * Industry and agriculture account for 100% of water usage in the U.S. |
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| * Carbon monoxide makes up 38% of the primary pollutants in the U.S. |
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