character: Rachel Carson
topic: Effects of Agricultural Runoff on Water Quality
grade: 9
subject: Science
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character: Environmental Science
topic: Impact of Pesticides on Aquatic Ecosystems
grade: 9
subject: Science
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character: Water Quality Monitoring
topic: Sources and Effects of Contaminants
grade: 9
subject: Science
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character: Ecosystems
topic: Nutrient Pollution and Algal Blooms
grade: 9
subject: Science
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