character: Professor John Smith
topic: Environmental Chemistry and Water Purification
grade: 12
subject: Chemistry
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character: Dr. Emily Johnson
topic: Impact of Pollution on Water Quality
grade: 12
subject: Chemistry
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character: Dr. Sarah Lee
topic: Advanced Techniques in Water Treatment
grade: 12
subject: Chemistry
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character: Mr. Michael Brown
topic: Chemical Principles in Environmental Science
grade: 12
subject: Chemistry
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