天体碰撞导致恐龙灭绝的理论被确证-凯发k8官网

天体碰撞导致恐龙灭绝的理论被确证
文章来源:未知 文章作者:meng 发布时间:2010-03-05 05:32 字体: [ ] 
(单词翻译:双击或拖选)

an international panel of experts has strongly 1 evidence that a space impact was behind the mass 2 event that killed off the 3.

一个国际专家小组强烈支持一场太空大碰撞导致地球上恐龙灭绝的理论。

the dinosaurs were one of many groups to go extinct
the dinosaurs were one of many groups to go extinct

they reached the 4(一致,舆论) after conducting the most wide-ranging analysis yet of the evidence.

writing in science journal, they rule out alternative theories such as large-scale volcanism(火山作用) .

the analysis has been discussed at the 41st lunar and planetary science conference (lpsc) in the us.

a panel of 41 international experts reviewed 20 years' worth of research to determine the cause of the cretaceous(白垩纪) -tertiary(第三纪) (k-t) mass extinction, around 65 million years ago.

the extinction wiped out more than half of all species on the planet, including the dinosaurs, bird-like pterosaurs(飞龙目) and large 5 6(爬行类) , clearing the way for mammals(哺乳类) to become the 7 species on earth.

their review of the evidence shows that the extinction was caused by a massive 8(小行星) or comet smashing(猛撞) into earth at chicxulub on mexico's yucatan peninsula.

'global winter'

when the 10km-15km space rock struck the yucatan, the explosive energy released was equivalent to 100 trillion tonnes of tnt(三硝基甲苯) - over a billion times more explosive than the bombs dropped on hiroshima and nagasaki.

the huge 9(弹坑,火山口) that 10 from the event is some 180km in diameter and surrounded by a circular fault about 240km in diameter.

"you can actually trace 11 right up to the 12(边缘) of the crater from across the world," co-author dr david kring, from the lunar and planetary institute in houston, told bbc news.

"you can start in europe, cross the atlantic and it just thickens as you approach the chicxulub impact crater."

in the new study, scientists examined the work of palaeontologists, geochemists(地球化学家) , climate modellers, geophysicists(地球物理学者) and sedimentologists who have been 13 evidence about the k-t extinction.

they conclude that the chicxulub space impact is the only 14 explanation for the 15 evident in geological records.

the initial impact would have triggered large-scale fires, huge earthquakes, and 16 17 which generated 18.

dr gareth collins, one of the review's co-authors from imperial college london, said the asteroid hit earth "20 times faster than a speeding bullet".

he added: "the explosion of hot rock and gas would have looked like a huge ball of fire on the horizon, 19(拷问,审问) any living creature in the 20 vicinity(紧邻) that couldn't find shelter."



点击收听单词发音收听单词发音  

1 a604e73131bb1a34283a5ebcd349def4     
vt.& vi.endorse的过去式或过去分词形式v.赞同( endorse的过去式和过去分词 );在(尤指支票的)背面签字;在(文件的)背面写评论;在广告上说本人使用并赞同某产品
参考例句:
  • the committee endorsed an initiative by the chairman to enter discussion about a possible merger. 委员会通过了主席提出的新方案,开始就可能进行的并购进行讨论。 来自《简明英汉词典》
  • the government has broadly endorsed a research paper proposing new educational targets for 14-year-olds. 政府基本上支持建议对14 岁少年实行新教育目标的研究报告。 来自《简明英汉词典》
2 spwzp     
n.熄灭,消亡,消灭,灭绝,绝种
参考例句:
  • the plant is now in danger of extinction.这种植物现在有绝种的危险。
  • the island's way of life is doomed to extinction.这个岛上的生活方式注定要消失。
3 87f9c39b9e3f358174d58a584c2727b4     
n.恐龙( dinosaur的名词复数 );守旧落伍的人,过时落后的东西
参考例句:
  • the brontosaurus was one of the largest of all dinosaurs. 雷龙是所有恐龙中最大的一种。 来自《简明英汉词典》
  • dinosaurs have been extinct for millions of years. 恐龙绝种已有几百万年了。 来自《简明英汉词典》
4 epmza     
n.(意见等的)一致,一致同意,共识
参考例句:
  • can we reach a consensus on this issue?我们能在这个问题上取得一致意见吗?
  • what is the consensus of opinion at the afternoon meeting?下午会议上一致的意见是什么?
5 77izo     
adj.海的;海生的;航海的;海事的;n.水兵
参考例句:
  • marine creatures are those which live in the sea. 海洋生物是生存在海里的生物。
  • when the war broke out,he volunteered for the marine corps.战争爆发时,他自愿参加了海军陆战队。
6 45053265723f59bd84cf4af2b15def8e     
n.爬行动物,爬虫( reptile的名词复数 )
参考例句:
  • snakes and crocodiles are both reptiles. 蛇和鳄鱼都是爬行动物。 来自《简明英汉词典》
  • birds, reptiles and insects come from eggs. 鸟类、爬虫及昆虫是卵生的。 来自《现代汉英综合大词典》
7 usaxg     
adj.支配的,统治的;占优势的;显性的;n.主因,要素,主要的人(或物);显性基因
参考例句:
  • the british were formerly dominant in india.英国人从前统治印度。
  • she was a dominant figure in the french film industry.她在法国电影界是个举足轻重的人物。
8 uo1yd     
n.小行星;海盘车(动物)
参考例句:
  • astronomers have yet to witness an asteroid impact with another planet.天文学家还没有目击过小行星撞击其它行星。
  • it's very unlikely that an asteroid will crash into earth but the danger exists.小行星撞地球的可能性很小,但这样的危险还是存在的。
9 wofzh     
n.火山口,弹坑
参考例句:
  • with a telescope you can see the huge crater of ve-suvius.用望远镜你能看到巨大的维苏威火山口。
  • they came to the lip of a dead crater.他们来到了一个死火山口。
10 1kmzty     
n.剩余物,残留物;遗体,遗迹
参考例句:
  • he ate the remains of food hungrily.他狼吞虎咽地吃剩余的食物。
  • the remains of the meal were fed to the dog.残羹剩饭喂狗了。
11 debris     
n.瓦砾堆,废墟,碎片
参考例句:
  • after the bombing there was a lot of debris everywhere.轰炸之后到处瓦砾成堆。
  • bacteria sticks to food debris in the teeth,causing decay.细菌附着在牙缝中的食物残渣上,导致蛀牙。
12 rxsxl     
n.(圆物的)边,轮缘;边界
参考例句:
  • the water was even with the rim of the basin.盆里的水与盆边平齐了。
  • she looked at him over the rim of her glass.她的目光越过玻璃杯的边沿看着他。
13 chmxz     
n.集会,聚会,聚集
参考例句:
  • he called on mr. white to speak at the gathering.他请怀特先生在集会上讲话。
  • he is on the wing gathering material for his novels.他正忙于为他的小说收集资料。
14 hbcyy     
adj.似真实的,似乎有理的,似乎可信的
参考例句:
  • his story sounded plausible.他说的那番话似乎是真实的。
  • her story sounded perfectly plausible.她的说辞听起来言之有理。
15 ku9zlf     
n.毁坏;荒废;极度震惊或悲伤
参考例句:
  • the bomb caused widespread devastation. 炸弹造成大面积破坏。
  • there was devastation on every side. 到处都是破坏的创伤。 来自《简明英汉词典》
16 zazyk     
adj.大陆的,大陆性的,欧洲大陆的
参考例句:
  • a continental climate is different from an insular one.大陆性气候不同于岛屿气候。
  • the most ancient parts of the continental crust are 4000 million years old.大陆地壳最古老的部分有40亿年历史。
17 5a0c95bd1e490515d70aff3ba74490cb     
山崩( landslide的名词复数 ); (山坡、悬崖等的)崩塌; 滑坡; (竞选中)一方选票占压倒性多数
参考例句:
  • landslides have cut off many villages in remote areas. 滑坡使边远地区的许多村庄与外界隔绝。
  • the storm caused landslides and flooding in savona. 风暴致使萨沃纳发生塌方和洪灾。
18 a759fe8c9bbe15580d54b753ecec1e73     
n.海啸( tsunami的名词复数 )
参考例句:
  • our oceans are alive with earthquakes, volcanoes, and more recently, tsunamis. 海中充满着地震、火山,包括最近发生的海啸。 来自常春藤生活英语杂志-2006年2月号
  • please tell me something more about tsunamis! 请您给我讲讲海啸吧! 来自辞典例句
19 fda9f429e8dac4e73e506139874fd98f     
v.烧烤( grill的现在分词 );拷问,盘问
参考例句:
  • the minister faced a tough grilling at today's press conference. 部长在今天的记者招待会上受到了严厉的盘问。
  • he's grilling out there in the midday sun. 他在外面让中午火辣辣的太阳炙烤着。 来自《简明英汉词典》
20 aapxh     
adj.立即的;直接的,最接近的;紧靠的
参考例句:
  • his immediate neighbours felt it their duty to call.他的近邻认为他们有责任去拜访。
  • we declared ourselves for the immediate convocation of the meeting.我们主张立即召开这个会议。
tag标签: space dinosaurs extinction
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