character: Mr. Lee
topic: Soil Chemistry and Agriculture
grade: 12
subject: Chemistry
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character: Dr. Smith
topic: Nutrient Cycling in Soils
grade: 12
subject: Chemistry
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character: Ms. Johnson
topic: Fertilizer Application Techniques
grade: 12
subject: Chemistry
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character: Professor Brown
topic: Impact of pH on Soil Health
grade: 12
subject: Chemistry
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