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新奇事件簿(翻译+字幕+讲解):小行星岩层揭露恐龙灭绝细节

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Scientists say they have unearthed details of how the dinosaurs were wiped out 65 million years ago. A team of geophysicists is analyzing rock formations in a crater under the seabed off Mexico. The rocks contain the remnants of the cataclysmic aftermath of a gigantic asteroid impacting with Earth. The scientists say the layers of rock they have extracted reveal a step-by-step account of the destruction that happened after the impact as rock and sediment settled on top of each other in revealing layers. Geophysicist Jay Melosh from Purdue University said: "It tells us what went on inside the crater on that day of doom that killed the dinosaurs. All of this mayhem is directly recorded in the core."

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小行星岩层揭露恐龙灭绝.jpg
Scientists say the asteroid was around three to four kilometers wide. It smashed into the ocean and created a hole 160kms wide and 20kms deep. This triggered a chain reaction of earthquakes, tsunami, icecap melting, landslides and fires that forever changed the geology and life forms on Earth, killing off the dinosaurs. The asteroid's impact hurled out rock and minerals and created a massive crater. Molten rock fell back into the crater, which was then filled with ocean water from tidal waves. This water was full of soil, vegetation, animal life and other debris, all of which settled in layers ready for scientists to analyze millions of years later. The scientists say this layer-forming process took just a few hours.

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重点单词   查看全部解释    
cataclysmic [,kætə'klizmik]

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adj. 大变动的;洪水的

 
fell [fel]

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动词fall的过去式
n. 兽皮
v

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impact ['impækt,im'pækt]

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n. 冲击(力), 冲突,影响(力)
vt.

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core [kɔ:]

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n. 果心,核心,要点
vt. 挖去果核

 
massive ['mæsiv]

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adj. 巨大的,大规模的,大量的,大范围的

 
reaction [ri'ækʃən]

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n. 反应,反作用力,化学反应

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sediment ['sedimənt]

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n. 沉淀物

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destruction [di'strʌkʃən]

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n. 破坏,毁灭,破坏者

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revealing [ri'vi:liŋ]

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adj. 有启迪作用的,透露内情的,袒露身体的 动词re

 
unearth ['ʌn'ə:θ]

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vt. 发掘,掘出,发现并披露

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关键字: 恐龙灭绝 小行星

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