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By Geoffrey M Horn

Readers of the twelve books in our soiled and unsafe Jobs will discover why such a lot of humans decide to paintings in occupations that positioned their lives at the line.

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31 INDEX alligators, 16, 16 Atlanta, Georgia, 25, 25, 27 Beijing, China, 11, 12 Big Necessity, The (book), 5 Bitonti, John, 11–13 blockages and clogs, 17, 17, 18, 20, 23 Boston, Massachusetts, 15 Page numbers in bold type are for photos, maps, and illustrations. , 27 World War II, 14 About the Author Geoffrey M. Horn has written more than four dozen books for young people and adults, along with hundreds of articles for encyclopedias and other works. He lives in southwestern Virginia, in the foothills of the Blue Ridge Mountains, with his wife and five cats.

Decay: To break down or rot. gravity: The force that causes things near the surface of Earth to fall. hip waders: Rubber boots that go as high as the hips. hydrogen sulfide: A poisonous gas that smells like rotten eggs. This gas, which is found in sewers, is formed when waste matter decays. laser: A highly focused beam of light that can be used for measuring, cutting, and many other applications. manhole: A covered place at street level from which inspection and repair crews can enter a sewer system.

Plumber. New York: Children’s Press, 2004. Miller, Connie Colwell. Garbage, Waste, Dumps, and You: The Disgusting Story Behind What We Leave Behind. Mankato, MN: Capstone Press, 2009. htm Clear diagrams and explanations show how wastewater is turned into clean water. org/AboutWater/ForStudents/WastewaterTimeline Enter the “Aquaventurer Time Machine” and explore 10,000 years of water treatment history. 31 INDEX alligators, 16, 16 Atlanta, Georgia, 25, 25, 27 Beijing, China, 11, 12 Big Necessity, The (book), 5 Bitonti, John, 11–13 blockages and clogs, 17, 17, 18, 20, 23 Boston, Massachusetts, 15 Page numbers in bold type are for photos, maps, and illustrations.

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