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What is sludge?
A. insects that live under rocks in streams
B. the liquid part of wastewater
C. the solids that are heavier than liquid wastewater and sink to the bottom
D. the solids, like fats, grease, and oil, that float on top of liquid wastewater
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the solids, like fats, grease, and oil, that float on top of liquid wastewater
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