character: Professor David Black
topic: Soil Erosion and Conservation Techniques
grade: 9
subject: Science
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character: Dr. Emily Carter
topic: Impact of Soil Erosion on Agriculture
grade: 9
subject: Science
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character: Mr. John Smith
topic: Methods to Prevent Soil Erosion
grade: 9
subject: Science
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character: Ms. Sarah Lee
topic: Restoration Techniques for Eroded Soils
grade: 9
subject: Science
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