Coral Reefs 101 | National Geographic

What are coral reefs? Coral can be found in tropical ocean waters around the world. But how much do you know about reefs and the tiny animals-polyps-that build them? Learn all about coral and why warming waters threaten the future of the reef ecosystem.
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Coral Reefs 101 | National Geographic
• Coral Reefs 101 | Nati...
National Geographic
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