character: Pollution Scientist
topic: Water Quality Assessment
grade: 9
subject: Science
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character: Environmental Scientist
topic: Water Pollution Monitoring
grade: 9
subject: Science
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character: Ecologist
topic: Impact of Pollution on Aquatic Life
grade: 9
subject: Science
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character: Hydrologist
topic: Groundwater Quality Assessment
grade: 9
subject: Science
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