character: River Ray
topic: Sources of Water Pollution and Their Effects
grade: 10
subject: Science
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character: Nutrient Pollution
topic: Causes and Effects on River Ecosystems
grade: 10
subject: Science
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character: Chemical Runoff
topic: Impact on River Water Quality
grade: 10
subject: Science
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character: Industrial Waste
topic: Contamination of Water Bodies
grade: 10
subject: Science
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