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17. Most air pollution results from ____. (1 point)the burning of fossil fuelsnuclear energy usevolcanic eruptionsthe evaporation of chemicals such as paints and dry-cleaning fluid18. An advantage of nuclear energy is that ____. (1 point)uranium is a nonrenewable resourceit does not contribute to air pollutionit makes use of the windit makes use of hot water from geysers19. Explain how groundwater can become polluted. (3 points)20. Why is conservation important today? (3 points)21. You notice green scum floating on the surface of a pond. How can you tell whether these organisms are plants?
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