【名师带你背单词】PTE高频考点自然类文章《火山下发现的巨大湖泊》,曼拓教育微信公众号文章

Dina老师

今天我们来看看这篇在PTE听力中常考的自然类文章。

《Huge lake discovered 15 kilometres under avolcano》

Dina老师

下面带着对这些单词和短语的理解，尝试读一读下面的原文，看看是不是容易理解多了呢？

Our planet is blue inside and out. A massive reservoir of water has been discovered deep beneath a volcano in the Andes, and Earth’s interior may be dotted with similar wet pockets lurking below other major volcanoes.

The unexpected water, which is mixed with partially melted magma, could help to explain why and how eruptions happen.

This water may also be playing a role in the formation of the continental crust we live on, and could be further evidence that our planet has had water circulating in its interior since its formation.

Jon Blundy of the University of Bristol, UK, and his colleagues made the discovery while studying a huge “anomaly” 15 kilometres beneath the currently dormant Uturuncu volcano in the Bolivian Andes. The anomaly, called the Altiplano-Puna magma body, slows down seismic waves and conducts electricity, unlike surrounding magma.

Blundy’s team took rocks that were spat out by an eruption of Uturuncu 500,000 years ago and mixed them with varying amounts of water before exposing them in the lab to conditions mimicking those in the anomaly.

This included pressures 30,000 times as high as atmospheric pressure, and temperatures up to 1500 °C. “We reproduced conditions deep in the Earth in the lab,” says Blundy.

They found that at a particular water content, the electrical conductivity exactly matched the value measured in the anomaly. “By weight, we calculated it contains 8 to 10 per cent water,” says Blundy.

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