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The summit craters represent the junction area of the volcanic activity through which breathes the persistent vent of Etna, and in more or less regular intervals, are the site of explosive events of various types as: Strombolian obstruction phreatic activities etc. that continually change the morphology.
Water partially fills a phreatic crater formed on the northern flank of Mammoth Mountain, the snow-covered peak in the background. This and other nearby craters were formed by explosive eruptions about 700 years ago that were distinct from nearby eruptions at the southern end of the Inyo Craters.