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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.
Crater. A volcanic crater is a bowl like structure at the top of a volcano around the opening that is used for eruption of magma and lava. This is a depression that is the result of sinking in of the rocks because of high pressure. Mostly it has the opening through which lava and ash flows upwards.rater. A volcanic crater is a bowl like structure at the top of a volcano around the opening that is used for eruption of magma and lava. This is a depression that is the result of sinking in of the rocks because of high pressure. Mostly it has the opening through which lava and ash flows upwards.