Still others argue that volcanic dust injected into the atmosphere shields Earth from the Sun's rays and initiates an ice age.

还有人认为，注入大气的火山灰保护地球免受太阳辐射，并开启了一段冰河时代。

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Were the colours made more intense by volcanic dust?

色彩因火山灰而更强烈了吗？

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One will remain entirely off limits because of the threat of volcanic dust.

一个地区由于火山灰的威胁，将完全禁止飞行。

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Crozier says the wind patterns that are pushing the volcanic dust towards Europe are expected to persist for days to come.

VOA: standard.2010.04.17

"It is not just a case of understanding the activity at the volcano itself, what we are also seeing the effect of at the moment are the prevailing weather conditions because we are in a northerly air stream at the moment and that is bringing the volcanic dust from Iceland down over the U.K.

VOA: standard.2010.04.15

One of the things that went missing in the shadow of that volcanic dust was a sense of human power.

ECONOMIST: Disasters are about people and planning, not nature��s pomp

Natural aerosols are produced by sea salt, desert dust, volcanic eruptions and smoke from forest fires.

ECONOMIST: Climatology: Grey-sky thinking | The

Complicating the issue is the volcanic eruption of Toba, in Sumatra, around 74, 000 years ago, which injected so much sulfurous dust into the high atmosphere that it caused prolonged droughts that might have come close to wiping out many human populations.

WSJ: Matt Ridley on Early Humans Leaving Africa | Mind & Matter