Volcanic ash provides nutrients to nearby soil, making the land fertile.

火山灰为附近的土壤提供养分，使土地肥沃。

The ash can melt if it's sucked into plane engines, so pilots are told not to fly through it.

火山灰会被飞机引擎吸入而融化，所以，飞行员被要求不要从火山灰里穿过。

Ash and cinders blazed down from the erupting volcano.

炽热的火山灰和火山渣从爆发的火山纷纷喷发落下.

They analysed it to find out what had fallen in over time—bits of plants, volcanic ash and even DNA from the mammoths themselves.

他们对其进行了分析，来找出随着时间流逝什么东西出现了——植物，火山灰，甚至是猛犸象自己的DNA。

If you inhaled too much, you could eventually develop silicosis.

果吸入太多火山灰，你最终会患上矽肺病。

But volcanic ash can be sand too.

但是火山灰也可以是沙子。

And some areas where ash is falling, residents were given masks to help them breath.

在一些火山灰下落的地区，予当地民众面罩来帮助他们呼吸。

It was active for about three weeks then, sending ash high into the air and blasting blocks, weighing as much as 14 tons.

它活跃了大约三周，将火山灰升到空中，并爆破重达14吨的石块。

Lava fountain sprayed, magma flowed, ash rained down on the surrounding region.

熔岩喷泉喷出，岩浆流出，火山灰雨点般在周围地区落下。

Mt. Semeru is the tallest mountain on the island, and its eruption has left entire villages covered with ash, hundreds of homes destroyed and more than a thousand people without a place to live.

塞梅鲁火山是岛上最高的山，这次喷发导致村庄被火山灰完覆盖，数百所房屋被毁，千余人无家可归。

That's how much of it was in the air.

空气中有很多（烟雾和火山灰）。

And one thing that's a threat to them are pyroclastic flows, when a mix of lava blocks, ash and volcanic gas rush down the slopes of a volcano.

对它们构成威胁的是火山碎屑流——即熔岩块、火山灰和火山气体的混合物冲下火山斜坡（的过程）。

This gas combined with hot ash can race down the sides of a volcano as fast as 100 miles per hour burning everything in its path.

这种气体和灼热的火山灰结合在一起，可以以每小时100英里的速度沿着火山的边缘向下侵袭，燃烧沿途的一切。

There is also a concern over volcanic ash and its effect on farmland.

火山灰对农田的影响也令人担忧。

Beneath the protecting shroud of ash, the city lay intact.

在厚厚的火山灰的保护下，这座城市完好无损。

There have been flights that have been delayed as a result of the ash, because, of course, ash, once it is emitted into the atmosphere, can be very damaging, very dangerous cure to air travel.

有航班因为火山灰而延误，因为，当然，火山灰一旦被排放到大气中，对航空旅行是非常有害，非常危险的。

With an explosion like that, ash may fall on surrounding villages.

像那样程度的爆发，火山灰就可能会落到周围的村庄上。

But, as we have learned in modern times how to disperse clouds somewhat, you might think we could manage to do something about these ash clouds as well.

但是，正我们在现代学会了何驱散云一样，你可能会认为我们也可以设法对付这些火山灰云。

He says he doesn't know where he's going, just somewhere out of the volcano's reach.

他说他不知道要去哪里，只要是火山灰无法波及的地方就行。

Slowly, his house had filled up with grey ash.

慢慢地，他的家里充满了灰色的火山灰。