英语听力文摘 English Digest 600、科学家如何预测火山喷发？

 　　it’s time again for the A Moment of Science mailbag. A listener writes:

 

　　Dear A Moment of Science,

 

　　I’ve always been fascinated by volcanoes. So I was wondering: How well can scientists predict when and where a volcano will erupt?

 

　　Intersting question.

 

　　There are a few well known warning signs, such as earthquakes in the vicinity of a known volcano. And, of course, smoke rising from a volcano.

 

　　But a study out of the UK could give scientists an even better idea of how to predict eruptions². The researchers were looking at volcanoes along the mid³ ocean ridge⁴ a long chain of volcanoes lined up along where two of the Earth’s tectonic plates pull apart.

　　Specifically, the researchers looked at the magma chambers⁵ beneath the volcanoes to see how they channel magma up to the surface.

 

　　Using satellite images, they built computer models and found that magma chambers can exist only 0.62 miles underground. That’s really shallow, considering that earlier models had shown that magma chambers along the rift⁶ lay much deeper.

 

　　The satellite images and computer models also revealed that the ground near a volcano often begins rising and swelling⁷ about four months before an eruption¹. Measuring group uplifting is key to predicting eruptions, although these precursors⁸ don’t always occur before an eruption.

 

　　Volcanoes along the mid ocean ridge erupt often, usually underwater, creating new crust. Studying the plumbing⁹ systems beneath these volcanoes helps scientists better understand how the Earth renews its surface.

1 eruption   

n.火山爆发；（战争等）爆发；（疾病等）发作

参考例句：

• The temple was destroyed in the violent eruption of 1470 BC.庙宇在公元前1470年猛烈的火山爆发中摧毁了。
• The eruption of a volcano is spontaneous.火山的爆发是自发的。

2 eruptions   

n.喷发，爆发( eruption的名词复数 )

参考例句：

• There have been several volcanic eruptions this year. 今年火山爆发了好几次。 来自《简明英汉词典》
• Over 200 people have been killed by volcanic eruptions. 火山喷发已导致200多人丧生。 来自辞典例句

3 mid   

adj.中央的，中间的

参考例句：

• Our mid-term exam is pending.我们就要期中考试了。
• He switched over to teaching in mid-career.他在而立之年转入教学工作。

4 ridge   

n.山脊；鼻梁；分水岭

参考例句：

• We clambered up the hillside to the ridge above.我们沿着山坡费力地爬上了山脊。
• The infantry were advancing to attack the ridge.步兵部队正在向前挺进攻打山脊。

5 chambers   

n.房间( chamber的名词复数 )；（议会的）议院；卧室；会议厅

参考例句：

• The body will be removed into one of the cold storage chambers. 尸体将被移到一个冷冻间里。 来自《简明英汉词典》
• Mr Chambers's readable book concentrates on the middle passage: the time Ransome spent in Russia. Chambers先生的这本值得一看的书重点在中间：Ransome在俄国的那几年。 来自互联网

6 rift   

n.裂口，隙缝，切口；v.裂开，割开，渗入

参考例句：

• He was anxious to mend the rift between the two men.他急于弥合这两个人之间的裂痕。
• The sun appeared through a rift in the clouds.太阳从云层间隙中冒出来。

7 swelling   

n.肿胀

参考例句：

• Use ice to reduce the swelling. 用冰敷消肿。
• There is a marked swelling of the lymph nodes. 淋巴结处有明显的肿块。

8 precursors   

n.先驱( precursor的名词复数 )；先行者；先兆；初期形式

参考例句：

• Phenyl (or polyphenyl) substituted epoxides serve as excellent precursors to phenyl (or diphenyl) carbenes. 某些苯代（或多苯）环氧乙烷是制取带苯环（或二苯）碳烯的极好原料。 来自辞典例句
• Note the presence of megakaryocytes, erythroid islands, and granulocytic precursors. 可见巨核细胞，红细胞岛和粒细胞前体细胞。 来自互联网

9 plumbing   

n.水管装置；水暖工的工作；管道工程v.用铅锤测量（plumb的现在分词）；探究

参考例句：

• She spent her life plumbing the mysteries of the human psyche. 她毕生探索人类心灵的奥秘。
• They're going to have to put in new plumbing. 他们将需要安装新的水管。 来自《简明英汉词典》