Europe's highest volcano sprayed round smoke

A recent eruption of Etna, Europe's most active and high volcano, forms a ring of white smoke shaped like a ring.

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Smoke circle is observed on the east coast of Sicily, Italy.(Photo: Sina)

The white round smoke from the crater rises into the air with a diameter of about 50m.(Photo: Sina)

Chris Weber, a German volcanic researcher, said white smoke circles may appear when active inside volcanoes are stronger than normal.(Photo: Sina)

Similar to smokers emitting round smoke from their mouths, the round smoke rose up from the deep crater shaped like a chimney.(Photo: Caters)

Etna is Europe's highest volcano with a height of 3.329m.This is one of the most active volcanoes in the world and in a state of continuous activity.Etna volcano is located on the island of Sicily, Italy.(Photo: Sina)

The eruption last December was considered the most intense in recent months.The eruption of volcanoes followed the explosions of the sky and lava flows shot up like a big fountain.Many flights have to be delayed and the airport has to stop working.(Photo: Corbis)