character: Mr. James Turner
topic: Chemical Principles in Water Purification
grade: 9
subject: Chemistry
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character: Dr. Emily Carter
topic: Water Quality and Treatment Processes
grade: 9
subject: Chemistry
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character: Ms. Sarah Johnson
topic: Introduction to Environmental Chemistry
grade: 9
subject: Chemistry
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character: Mr. Brian Smith
topic: Chemical Reactions in Water Filtration
grade: 9
subject: Chemistry
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