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10 surprising facts about coral reefs... - The Reef-World …
Coral Reefs - National Geographic Society
Coral reef facts for kids! - National Geographic Kids
20 Coral Reef Facts You Need to Know | Fact Retriever
15 Amazing Coral Reefs Facts - Ocean Info
Coral reef - Wikipedia
Coral - National Geographic Society
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Coral reef | Description, Geochemistry, Origins, & Threats
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