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  1. Coral Reef Waterworld | Bracknell's Water World | Swim, Slides

  2. Coral reef - Wikipedia

  3. Coral Reefs - National Geographic Society

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

  5. What is a coral reef? | Natural History Museum

  6. Coral - National Geographic Society

  7. Coral reef ecosystems - National Oceanic and Atmospheric Administration

  8. Coral Reefs Ecology & Biodiversity - Coral Reef Alliance

  9. Coral Reefs 101 | National Geographic - YouTube

  10. Coral reefs guide: what is coral and coral bleaching, and species …