character: Dr. John Smith
topic: Effect of Soil Composition on pH Levels
grade: 12
subject: Chemistry
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character: Ms. Laura Green
topic: Influence of Organic Matter on Soil Acidity
grade: 12
subject: Chemistry
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character: Mr. Frank White
topic: Role of Soil Minerals in pH Variation
grade: 12
subject: Chemistry
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character: Dr. Emily Brown
topic: Impact of Fertilizers on Soil pH Balance
grade: 12
subject: Chemistry
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