character: Dr. James Parker
topic: Understanding Soil Chemistry: An Overview
grade: 12
subject: Chemistry
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character: Dr. Maria Lopez
topic: The Role of pH in Soil Chemistry
grade: 12
subject: Chemistry
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character: Dr. Robert Smith
topic: Nutrient Cycling in Soil: A Chemical Perspective
grade: 12
subject: Chemistry
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character: Dr. Emily Johnson
topic: Soil Organic Matter and Its Chemical Interactions
grade: 12
subject: Chemistry
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