character: Great Barrier Reef
topic: Largest Coral Reef System
grade: 6
subject: Geography
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character: Coral Reefs
topic: Ecosystem Importance
grade: 6
subject: Geography
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character: Marine Biologists
topic: Conservation Efforts
grade: 6
subject: Geography
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character: Climate Change
topic: Impact on Coral Reefs
grade: 6
subject: Geography
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