character: Captain Wave
topic: How Rivers Erode and Deposit Sediments
grade: 4
subject: Science
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character: Dr. Stream
topic: The Process of River Erosion
grade: 4
subject: Science
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character: Sediment Sally
topic: Sediment Transportation in Rivers
grade: 4
subject: Science
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character: River Ranger
topic: Understanding River Ecosystems
grade: 4
subject: Science
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