character: Mr. David Brown
topic: Soil Composition and Its Effects on Agriculture
grade: 11
subject: Chemistry
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character: Dr. Emily Johnson
topic: Nutrient Cycling in Soil
grade: 11
subject: Chemistry
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character: Professor Alan Smith
topic: The Role of pH in Soil Health
grade: 11
subject: Chemistry
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character: Ms. Sarah Lee
topic: Impact of Organic Matter on Soil Fertility
grade: 11
subject: Chemistry
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