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

  2. Coral reef - Wikipedia

  3. What is a Coral Reef? - NASA

  4. Coral Reefs and Corals - Smithsonian Ocean

  5. NOAA CoRIS - What are Coral Reefs

  6. What is a coral reef made of? - NOAA's National Ocean Service

  7. Corals Tutorial: How Do Coral Reefs Form? - NOAA's National Ocean Service

  8. What Makes a Coral Reef? - National Oceanic and Atmospheric …

  9. Coral Reef Ecosystem: Structure, Food Web, and Types - Earth …

  10. Coral Reefs – Types, Structure, Habitat, Formation, Importance