character: Dr. Lisa Wang
topic: Chemical Properties of Soil Components
grade: 12
subject: Chemistry
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character: Professor John Smith
topic: Impact of Soil pH on Plant Growth
grade: 12
subject: Chemistry
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character: Dr. Emily Carter
topic: Nutrient Cycling in Soil Ecosystems
grade: 12
subject: Chemistry
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character: Mr. Alan Brown
topic: Soil Composition and its Effect on Agriculture
grade: 12
subject: Chemistry
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