Around the same time, a massive volcanic eruption in the Wrangell Mountains in Alaska occurred, blanketing the area in a layer of ash, up to a foot deep, called the White River tephra.

大致在同一时期，阿拉斯加州的弗兰格尔山脉出现了大规模的火山爆发，这个地区遂被深达一英尺的怀特河火山灰所覆盖。

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A heavy layer of volcanic ash rained down over the Aegean, covering islands and crops.

浓厚的火山灰层大量降下到爱琴海，遮盖了岛屿和农作物。

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All these a re of great significance to the research of deep-layer volcanic rock reservoirs and the evaluation of natural gas in Songliao Basin.

所取得的成果对松辽盆地深层火成岩储层的研究及天然气评价都具有十分重要的意义。

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Metop's suite of instruments retrieve a range of data - from the temperature and water content of the different layers in the atmosphere to the speed of the winds whipping across the ocean, and from the health of the ozone layer to the spread of volcanic ash plumes across the sky.

BBC: Weather satellites and the gathering storm