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CWEB - These pillow basalts, seen on Dive 6 at Fina Nagu Caldera C, form when basaltic lava erupts underwater. Cold seawater chills the erupting lava, creating a rounded tube of basalt crust that looks like a pillow. As the newly erupting lava pushes through the chilled basalt crust, it can form scratches on the pillow surface, called striations.
Video courtesy of the NOAA
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