名词解释题火山弹(volcanic bomb)

名词解释题
火山弹(volcanic bomb)

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The city centre was wiped out by the bomb.A: coveredB: destroyedC: reducedD: moved

共用题干Older Volcanic EruptionsVolcanoes were more destructive in ancient history,not because they were bigger,but because the carbon dioxide they released wiped out life with greater ease.Paul Wignall from the University of Leeds was investigating the link between volcanic eruptions and mass extinctions.Not all volcanic eruptions killed off large numbers of animals,but all the mass extinctions over the past 300 million years coincided with huge formations of volcanic rock.To his surprise,the older the massive volcanic eruptions were,the more damage they seemed to do.He calculated the"killing efficiency" for these volcanoes by comparing the proportion of life they killed off with the volume of lava(熔岩)that they produced.He found that size for size,older eruptions were at least 10 times as effective at wiping out life as their more recent rivals.The Permian(二叠纪)extinction,for example,which happened 250 million years ago,is marked by floods of volcanic rock in Siberia that cover an area roughly the size of western Europe.Those volcanoes are thought to have pumped out about 10 gigatonnes of carbon as carbon dioxide.The global warming that followed wiped out 80 percent of all marine genera(种类)at the time,and it took 5 million years for the planet to recover.Yet 60 million years ago,there was another huge amount of volcanic activity and global warming but no mass extinction.Some animals did disappear but things returned to normal within ten thousand of years."The most recent ones hardlyhave an effect at all,"Wignall says.He ignored the extinction which wiped out the dinosaurs 65 million years ago,because many scientists believe it was primarily caused by the impact of an asteroid(小行星).He thinks that older volcanoes had more killing power because more recent life forms were better adapted to dealing with increased levels of CO2.Vincent Courtill.ot,director of the Paris Geophysical Institute in France,says that Wignall's idea is provocative.But he says it is incredibly hard to do these sorts of calculations.He points out that the killing power of volcanic eruptions depends on how long they lasted.And it is impossible to tell whether the huge blasts lasted for tliousands or millions of years.He also adds that it is difficult to estimate how much lava prehistoric volcanoes produced,and that lava volume may not necessarily correspond to carbon dioxide emissions。What is the main thesis of the article?A:Volcanic eruptions are riot always deadly.B:Older volcanic eruptions are more destructive.C:Carbon dioxide emissions often give rise to global warming.D:It is not easy to calculate the killing power of a volcanic eruption.

In the confusion after the bomb blast,I lost my bag and wasn't able to stop and look for it.A:hurry B:disorderC:circumstance D:panic

In April,thousands of holidaymakers remained__________abroad due to the volcanic ash cloud.A.stickingB.stuckC.to be stuckD.to have stuck

The bomb destroyed a police station and damaged a church( ) A.badly B.bad C.worse D.mostly

The following are the volcanic mountains in North Island except()ARuapehuBMt CookCNgaurohoeDTongariro

火山弹(volcanic bomb)

火山弹

火山弹属于()喷出物,火山角砾岩为()喷出物。A、固态、液态B、固态、固态C、液态、液态D、液态、固态

火山泥(volcanic mud)

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JavaScript由核心()组成。A、BOMB、jQueryC、ECMAScriptD、DOM

多选题火山碎屑岩又划分了()。A火山弹B火山集块岩C火山灰D火山角砾岩E凝灰岩

名词解释题火山泥(volcanic mud)

单选题火山弹属于()喷出物,火山角砾岩为()喷出物。A固态、液态B固态、固态C液态、液态D液态、固态

单选题Evidence collected by the spacecraft on Mars shows some present volcanic action,though the volcanoes are believed to be dormant if not dead.AdeceasedBdepartedCdisappeared.Dextinct

名词解释题火山弹

单选题According to the passage, some people started a national association so as to _____.Ainstruct people how to keep the bomb safe at homeBcoordinate the mass production of the destructive weaponCpromote the large-scale sale of this newly invented weaponDblock any legislation to ban the private possession of the bomb

单选题Airport security was extra tight()yesterday's bomb attacks.Ain the wake ofBsinceCinspite ofDduring

单选题During volcanic _____, dark clouds of smoke fill the sky, bringing fears to local residents.AeruptionBejectionCerosionDerection

单选题火山碎屑岩火山角砾岩、凝灰岩和()A火山弹B火山集块岩C火山灰D火山熔岩

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单选题The following are the volcanic mountains in North Island except()ARuapehuBMt CookCNgaurohoeDTongariro

单选题The bomb will ______ the moment it is touched.Ago on Bgo off Cgo out Dgo over