character: Prof. Alan Green
topic: Soil Chemistry
grade: 12
subject: Chemistry
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character: Dr. Jane Smith
topic: Soil Composition and Nutrients
grade: 12
subject: Chemistry
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character: Mr. Tom Brown
topic: Effects of pH on Soil Chemistry
grade: 12
subject: Chemistry
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character: Ms. Lisa White
topic: Fertilizers and Soil Chemistry
grade: 12
subject: Chemistry
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