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![Gulf of Alaska Expedition 2004 expl1157.jpg Gulf of Alaska Expedition 2004](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_expl1157.jpg?itok=JQ_grhGs)
Description
Gulf of Alaska Expedition 2004. A cross sectional view through a fracturedpillow basalt. The outer curved surface is the chilled rind, and the wedgesthat radiate from the center are fractures caused by rapid cooling of moltenlava in the cold seawater. The red laser points are 10 cm (~4 in) apart,giving the observers in the submarine a sense of scale. (Image credit: Gulf of Alaska 2004. NOAA, WHOI, and the Alvin Group)