本帖最后由 人与自然 于 2013-11-16 18:35 编辑
http://www.dailymail.co.uk/scien ... ws-molten-lava.html
《每日邮报》11月15日消息，最近在意大利埃特纳火上空出现了罕见的天使云，堪称大自然鬼斧神工的奇观！
Volatile volcano Mount Etna has been blowing perfect smoke rings after erupting violently on November 11 and has since produced regular explosions, as well as dozens of perfect vortex rings
In 2,000 when the volcano produced another series of impressive rings, Two volcanologists, said they could be formed by rapid gas pulses emitted by narrow vents into the atmosphere. More recent rings are pictured
Volatile volcano Mount Etna has been blowing perfect smoke rings after erupting violently on November 11 and has since produced regular explosions, as well as dozens of perfect vortex rings
It is not the first time that Etna has managed to produce the circular steam rings and photographs have been taken of them since the 1970s and notably in the year 2000. Here, it is possible to see the steam rings above the volcano
German volcanologist Dr Tom Pfeiffer believes the reason for the unusual smokey formations is because the violent eruption had changed the morphology of a vent
埃特纳火山位置
Mount Etna is an active volcano on the east coast of Sicily, Italy, close to the cities of Messina and Catania. It lies on a convergent plate margin between the African plate and the Erasian Plate. It is the tallest active volcano on the European continent at 3,329m high
When Etna started to erupt last month (pictured) none of the villages of Catania, dotted around the mountain, needed to be evacuated, though airspace over the southern Italian island was briefly closed
More than 25 per cent of Sicily's population lives on Etna's slopes, and it is the main source of income for the island - a combination of agriculture, due to its rich volcanic soil, and tourism. Here, Etna is pictured erupting last month | 
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