character: Hydrologist
topic: Water Cycle
grade: 9
subject: Science
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character: Pollution Scientist
topic: Water Quality Assessment
grade: 9
subject: Science
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character: Environmental Scientist
topic: Impact of Pollution on Water Systems
grade: 9
subject: Science
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character: Climatologist
topic: Effects of Climate Change on the Water Cycle
grade: 9
subject: Science
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