Geologists estimate that three times more volcanic activity occurs under the sea than on land. Around submarine volcanoes there are lava flows, sand and fractured rock. The top photograph is of a fracture – it may be leaking warmer water, as fish seem to be attracted to it. The lower image is of a lava flow. The rounded lumps of solidified rock are called pillow lava, which only form when molten rock – around 1,200ºC – comes into contact with sea water.
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