character: Dr. Michael Brown
topic: Effects of pH on Nutrient Availability in Soils
grade: 12
subject: Chemistry
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character: Dr. Linda Thompson
topic: Soil Chemistry and Plant Nutrition
grade: 12
subject: Chemistry
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character: Professor John Smith
topic: The Role of Soil pH in Agriculture
grade: 12
subject: Chemistry
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character: Dr. Sarah Johnson
topic: Impact of Soil pH on Microbial Activity
grade: 12
subject: Chemistry
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