Grand Canyon 'formed recently' 大峽谷是'近年才形成的'

更新時間 2014年 1月 31日, 星期五 - 格林尼治標準時間10:15

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The Grand Canyon at dusk

The Grand Canyon is in the state of Arizona

世界著名的美國亞利桑那州的大峽谷可能比先前想像的歷史要短得多。新的科研顯示這一世界奇的形成僅有五至六百萬年的時間。這比先前的說法要短得多。以前的研究聲稱大峽谷已經有七千萬年歷史。以下是 BBC 科學事務記者 Jonathan Amos 發回的報道:

Millions of tourists are drawn each year to the Grand Canyon to see its impressive rocks, which record nearly two billion years of Earth history. Running for almost 450km and to a depth of 1,800m, it is almost too vast to take in.

Its huge scale has also been problematic for scientists who've spent years gathering data from different locations through the canyon to try to work out its true age.

Some of the most recent investigations had indicated an ancient origin, while others thought it was much younger.

Now a new study in the Nature Geoscience journal pulls it all together. It finds, yes, the Grand Canyon has very old segments, but the full system was only cut into the form we know today by the Colorado River just over five million years ago.

Quiz 聽力測驗

Where is the Grand Canyon?

In the American state of Arizona.

How big is the Grand Canyon?

It is almost 450km long and 1,800m deep.

Where was the study published?

It was published in the Nature Geoscience journal.

Which verb in the report is similar in meaning to 'collecting'?


Glossary 词汇表 (点击单词收听发音)

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