character: Mr. John Smith
topic: Understanding Soil Composition and its Chemical Properties
grade: 12
subject: Chemistry
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character: Mrs. Emily Brown
topic: Chemical Reactions in Soil Enhancements
grade: 12
subject: Chemistry
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character: Dr. Robert Green
topic: The Role of pH in Soil Chemistry
grade: 12
subject: Chemistry
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character: Ms. Lisa White
topic: Nutrient Cycling in Soil Ecosystems
grade: 12
subject: Chemistry
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