character: Professor John Smith
topic: Fundamentals of Soil Chemistry
grade: 12
subject: Chemistry
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character: Dr. Emily Johnson
topic: Chemical Properties of Soil
grade: 12
subject: Chemistry
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character: Dr. Sarah Lee
topic: Soil pH and Nutrient Availability
grade: 12
subject: Chemistry
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character: Mr. Brian Turner
topic: Environmental Impact of Soil Chemistry
grade: 12
subject: Chemistry
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