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![Mud volcano caused by methane gas bubbling up through the sea floor witha resultant small cone that looks similar to a lava producing volcano sanc0468.jpg Mud volcano caused by methane gas bubbling up through the sea floor witha resultant small cone that looks similar to a lava producing volcano](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_sanc0468.jpg?itok=Y1tDOhxi)
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Mud volcano caused by methane gas bubbling up through the sea floor witha resultant small cone that looks similar to a lava producing volcano. Theplumes are of methane gas pushing up an accompanying cloud of sediment. (Image credit: Rhode Island Institute for Archaeological Oceanography; Secrets of the Gulf Expedition. NOAA/NOS/NMS/FGBNMS. | Institute for Exploration.)