该城建立在火成岩与火山灰上。
色彩因火山灰而更强烈了吗？
这种热气随后冲上大气层，并拖曳着黑色火山灰。
This hot gas then rises up in the atmosphere, dragging the dark ash with it.
因为火山灰把阳光挡住了。
产生的问题就是你在这里看到的火山灰。
全是她说，火山灰云的移动是很难预测的。
But she said the ash cloud's movement is difficult to predict.
第一个，由于火山灰的威胁仍将完全关闭。
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。
One will remain entirely off limits because of the threat of volcanic dust.
第一和第三次的爆发的火山灰覆盖了大部分北美州。
Both the first and third eruptions covered most of North America with ash.
这座沿海的城市很快就被十英尺深的火山灰掩埋。
The coastal city was soon buried beneath ash that measured more than ten feet deep.
问题就是火山灰。
而火山灰数量稍少的地区，电力站与通讯中继站可能会遭到破坏。
Less ash than that would knock out electrical power and relay stations.
而火山灰数量稍少的地区，电力站与通讯中继站可能会遭到破坏。
Less ash than that would knock out electrical power and relay stations.
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