ROV arm collecting a rock sample from the 1868 lava flow in order to confirm the age of the substrate using geochemical ratio and weathering analysis. The laser points (red dots) are 10 centimeters (~4 inches) apart and are used by scientists to determine the sizes of things that they are seeing.
Rock Sample
Image courtesy of the NOAA Office of Ocean Exploration and Research, 2015 Hohonu Moana. Download larger version (jpg, 391 KB).

ROV arm collecting a rock sample from the 1868 lava flow in order to confirm the age of the substrate using geochemical ratio and weathering analysis. The laser points (red dots) are 10 centimeters (~4 inches) apart and are used by scientists to determine the sizes of things that they are seeing.

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