character: Chemical Runoff
topic: Effects on River Water Quality
grade: 10
subject: Science
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character: Eutrophication
topic: Nutrient Pollution in Water Bodies
grade: 10
subject: Science
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character: Pesticides
topic: Impact on Aquatic Ecosystems
grade: 10
subject: Science
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character: Heavy Metals
topic: Contamination and River Health
grade: 10
subject: Science
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