character: Dr. Ocean
topic: How Oceans Affect River Systems
grade: 6
subject: Geography
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character: Captain Current
topic: The Role of Ocean Currents in River Flow
grade: 6
subject: Geography
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character: Professor Estuary
topic: Estuaries: Where Rivers Meet Oceans
grade: 6
subject: Geography
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character: Wave Rider
topic: Tides and Their Impact on River Levels
grade: 6
subject: Geography
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