When large volcanoes erupted they just burst tons of particle into the atmosphere where the particles then reflect light.

当火上爆发式会有很多吨的粉尘进入大气层，之后便反射了光线。

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According to the U.S. Geological Survey, more than 600 volcanoes occur in the San Francisco Volcanic Field, and they have erupted at various times over the past 6 million years.

据美国地质调查局，旧金山火山带上大约有600座火山，在过去的6百万年里，它们爆发在不同的时期。

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According to the U. s. Geological Survey, more than 600 volcanoes occur in the San Francisco Volcanic Field, and they have erupted at various times over the past 6 million years.

据美国地质调查局，旧金山火山带上大约有600座火山，在过去的6百万年里，它们爆发在不同的时期。

youdao

Volcanoes have erupted in the past, and will continue to erupt in the future.

BBC: Iceland��s Cinderella story

It boasts a fearsome array of volcanoes, 33 of which have erupted once or more since the end of the last ice age, around 12, 000 years ago.

ECONOMIST: Volcanoes and air travel: Small eruption in Iceland | The