character: Professor John Smith
topic: Chemical Reactions in Soil Acidification
grade: 12
subject: Chemistry
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character: Dr. Emily Brown
topic: Impact of Acid Rain on Soil Chemistry
grade: 12
subject: Chemistry
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character: Professor Michael Johnson
topic: Soil pH and Its Effects on Plant Growth
grade: 12
subject: Chemistry
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character: Dr. Sarah Lee
topic: Nutrient Availability in Acidic Soils
grade: 12
subject: Chemistry
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