Matt Dornback, from the NOAA National Centers for Environmental Information, photographs a rock sample from the day’s dive. Rock samples are being collected during most dives for later age-dating and geochemical analysis to provide more information about the geologic history and age of seamounts in the Johnston Atoll Unit.

Matt Dornback, from the NOAA National Centers for Environmental Information, photographs a rock sample from the day’s dive. Rock samples are being collected during most dives for later age-dating and geochemical analysis to provide more information about the geologic history and age of seamounts in the Johnston Atoll Unit. Image courtesy of the NOAA Office of Ocean Exploration and Research, 2017 Laulima O Ka Moana.

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