character: Dr. Michael Brown
topic: Soil pH and Nutrient Availability
grade: 12
subject: Chemistry
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character: Jane Smith
topic: Impact of Soil pH on Plant Growth
grade: 12
subject: Chemistry
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character: Tom Johnson
topic: Chemistry of Soil Fertility
grade: 12
subject: Chemistry
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character: Lisa White
topic: Nutrient Cycling in Soils
grade: 12
subject: Chemistry
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