character: Dr. Emily Johnson
topic: Soil Organic Matter and Its Chemical Interactions
grade: 12
subject: Chemistry
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character: Dr. Mark Stevens
topic: The Role of Humic Substances in Soil Chemistry
grade: 12
subject: Chemistry
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character: Dr. Sarah Fields
topic: Impact of Soil pH on Organic Matter Decomposition
grade: 12
subject: Chemistry
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character: Dr. Laura Green
topic: Nutrient Cycling in Soil: The Importance of Organic Matter
grade: 12
subject: Chemistry
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