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  1. 10 surprising facts about coral reefs... - The Reef-World …

  2. Coral Reefs - National Geographic Society

  3. Coral reef facts for kids! - National Geographic Kids

  4. 20 Coral Reef Facts You Need to Know | Fact Retriever

  5. 15 Amazing Coral Reefs Facts - Ocean Info

  6. Coral reef - Wikipedia

  7. Coral - National Geographic Society

  8. 12 interesting coral reef facts - Ocean Generation

  9. Coral reef | Description, Geochemistry, Origins, & Threats

  10. 10 amazing facts about coral reefs (and one terrible truth)