character: Mr. Johnson
topic: Pollution and Remediation
grade: 12
subject: Geography
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character: Dr. Smith
topic: Sources of Heavy Metal Contamination
grade: 12
subject: Geography
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character: Ms. Garcia
topic: Effects of Pollution on Aquatic Environments
grade: 12
subject: Geography
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character: Professor Lee
topic: Remediation Techniques for Water Pollution
grade: 12
subject: Geography
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