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Corals
A thin section of black coral shows annual bands that depend on temperature.
B. Williams, NOAA
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Ocean acidification troubles
The seas in which corals and other calcifying species dwell are turning acidic, their pH slowly dropping as Earth's oceans acidify in response to increased carbon dioxide... More »
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Corals: Storehouse for Temperature Data
Last Updated on 2012-05-07 at 18:16
Corals are marine animals that form external skeletons (exoskeletons) of calcium carbonate (CaCO3). Colonies of corals produce reefs in clear, shallow waters. These animals... More »
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