十万个为什么·科学阅读30篇（3）
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How Do Coral Reefs Grow So Slowly?
珊瑚礁为什么生长得如此缓慢？
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Tiny coral animals build hard skeletons from seawater.
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They use calcium and carbon to make limestone.
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Each polyp adds just a few millimeters per year.
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Warm, clear, shallow water helps them grow best.
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Reefs need sunlight for algae living inside them.
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Storms or pollution can kill whole sections fast.
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Some reefs are thousands of years old today.
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That’s why protecting them matters so much now.