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Dictionaryac'tivated sludge'sludge (def. 8). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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© 2000–2009 Pearson Education, publishing as Fact Monster™
Part of Family Education Network | Homework Help | Reference Site | K-8 Kids | Poptropica | Parenting Advice | Teacher Resources | Online Gradebook
© 2000–2009 Pearson Education, publishing as Fact Monster™
