character: Dr. Green
topic: Effects of Erosion on Soil Quality
grade: 9
subject: Geography
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character: Dr. Green
topic: Soil Conservation Techniques
grade: 9
subject: Geography
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character: Dr. Green
topic: Impact of Erosion on Agriculture
grade: 9
subject: Geography
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character: Dr. Green
topic: Sediment Transport and Its Effects
grade: 9
subject: Geography
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