character: Professor Brown
topic: Soil Composition and its Role in Ecosystems
grade: 9
subject: Geography
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character: Dr. Green
topic: The Impact of Soil Erosion on Biodiversity
grade: 9
subject: Geography
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character: Ms. Clay
topic: Nutrient Cycling in Soil and Ecosystem Health
grade: 9
subject: Geography
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character: Mr. Sand
topic: Types of Soil and their Effect on Plant Growth
grade: 9
subject: Geography
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