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Listen to native speakers pronounce “calcium carbonate” in real conversational contexts with synchronized timestamps and subtitles.
They'll take ions of calcium and ions of carbon out of the water column, and they'll use it to synthesize what is effectively rock--calcium carbonate. And if you look at the bottom of this coral polyp, then the cross-section, it's all white under there.That white is rock that's made biologically by the coral.
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