character: Mr. Lewis
topic: Chemical Analysis of Heavy Metal Contamination in Rivers
grade: 11
subject: Chemistry
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character: Dr. Smith
topic: Impact of Heavy Metals on Aquatic Life
grade: 11
subject: Chemistry
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character: Ms. Johnson
topic: Testing Methods for Water Quality
grade: 11
subject: Chemistry
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character: Prof. Adams
topic: Environmental Chemistry of River Systems
grade: 11
subject: Chemistry
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