character: Mr. Frank White
topic: Role of Soil Minerals in pH Variation
grade: 12
subject: Chemistry
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character: Dr. Susan Green
topic: Influence of Organic Matter on Soil pH
grade: 12
subject: Chemistry
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character: Professor John Smith
topic: Chemical Reactions in Soil Acidification
grade: 12
subject: Chemistry
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character: Ms. Emily Davis
topic: The Impact of Fertilizers on Soil pH Levels
grade: 12
subject: Chemistry
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