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Canyon
Grade 4
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Water Please!

Water pollution is caused by from humans, farming, and industry. These wastes harm water because they contain and . Chemicals or animals wastes called that are used to treat soil can pollute groundwater. Chemicals that kill insects, or , are carried along with runoff water. If these pass into rivers and lakes, the that live there may die. Wastes buried in a(n) can also pollute groundwater. A landfill is a place where solid wastes are buried between layers of .