character: Professor Johnson
topic: Impact of Erosion on Soil Preservation
grade: 9
subject: Geography
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character: Dr. Smith
topic: Soil Conservation Techniques
grade: 9
subject: Geography
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character: Ms. Davis
topic: Effects of Urbanization on Soil Erosion
grade: 9
subject: Geography
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character: Mr. Lee
topic: Natural Factors Influencing Soil Degradation
grade: 9
subject: Geography
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