character: Mr. David Lee
topic: Soil Chemistry and Nutrient Availability
grade: 12
subject: Chemistry
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character: Dr. Emily Chen
topic: Environmental Chemistry and Soil Composition
grade: 12
subject: Chemistry
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character: Ms. Sarah Johnson
topic: Plant Nutrition and Soil Fertility
grade: 12
subject: Chemistry
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character: Mr. Alex Thompson
topic: Chemical Processes in Soil Ecosystems
grade: 12
subject: Chemistry
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