Using radiometric dating methods, Sugden determined that the ash settled into the fissure after a volcanic eruption 8.1 million years ago.
用辐射测量鉴定年代的方法,萨格登测定那些灰烬是810万年前火山爆发后沉积在石缝中的。
Meanwhile, German air traffic control said its air traffic won't be affected by a possible return of the volcanic ash cloud before Wednesday.
以此同时,德国空中交通管制部门宣布,除了火山灰云飘回外,德国的航空在下周三前不会受到影响。
It's built on volcanic rock and ash.
该城建立在火成岩与火山灰上.
For example Mount Fuji might explode, and Tokyo might be buried in volcanic ash – there are all kinds of possible natural disaster, he says.
他表示:例如,富士山可能会爆炸,东京可能被火山灰淹没&这些都是有可能发生的自然灾难。
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