WHOI diver Pat Lohmann uses an underwater pneumatic drill to extract a 1.5-inch-wide core sample of coral skeleton from coral off Jarvis Island. The skeletons record chemical changes that reflect properties of surrounding seawater.

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WHOI diver Pat Lohmann uses an underwater pneumatic drill to extract a 1.5-inch-wide core sample of coral skeleton from coral off Jarvis Island. The skeletons record chemical changes that reflect properties of surrounding seawater.

© Chip Young (NOAA)

WHOI diver Pat Lohmann uses an underwater pneumatic drill to extract a 1.5-inch-wide core sample of coral skeleton from coral off Jarvis Island. The skeletons record chemical changes that reflect properties of surrounding seawater. photo copyright Chip Young (NOAA) taken at and featuring the class

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