character: Professor Lee
topic: Understanding Sediment Transport in Rivers
grade: 9
subject: Geography
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character: Dr. Wang
topic: The Role of Water Flow in Erosion
grade: 9
subject: Geography
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character: Ms. Johnson
topic: How Sediments Affect River Ecosystems
grade: 9
subject: Geography
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character: Mr. Smith
topic: River Dynamics and Their Environmental Impact
grade: 9
subject: Geography
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