SETI Institute#PPOD: This is actually a mud volcano in eastern Russia, named Pugachevskiy. It is located on the Sakhalin island. The mud volcanoes are formations generated by the release of gases and liquids. The mud is pushed to the surface as the pressure builds up beneath the Earth, creating an unusual pattern. We could not find a precise measurement of its size, but judging from other photographs, it is likely around 100 m in diameter. Credit: Mikhail Mikhailov/Caters News Agency
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