NOAA Ocean Explorer: Estuary to the Abyss

Scientists can cross-section small coral fragments and look for visible lines that indicate growth. We can relate these lines to changes in chemical composition and determine if changes in growth rates are linked to water temperature..

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Estuary to the Abyss

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http://oceanexplorer.noaa.gov/explorations/04etta/background/coral_ecology/media/coral_chip.html