Sicily's Mount Etna blows 'rare' smoke rings into the sky

Mount Etna sends amazing volcanic smoke rings billowing into the sky. Rare phenomenon can only form in a circular volcanic vent and requires a calm atmosphere. The rare phenomenon - known as volcanic smoke ring - can only be seen in circular volcanic vents and requires calm atmosphere to form.

Mount Etna has created a spectacular new crater on the volcano's summit. A new crater has been created on the summit of the Italian volcano. Mount Etnna puffs'smoke rings' in a rare display of its rare display. The volcano's new crater is a spectacular sight for tourists and locals.

The "volcanic vortex rings" are a rare phenomenon generated by the combination of rapid gas release and the vent shape, spewed out of a new crater that opened on Etna's summit. The phenomenon was created by combination of a combination of gas and vent shape.

Mount Etna puffs'smoke rings' in rare display. A new crater on the volcano's summit has created a spectacular sight for tourists and locals. Mount Etnna's new crater created by a new crater creates a spectacular view of the mountain's summit.