首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
One fine day about 74 000 years ago, a giant volcano on Sumatra blew its top. The volcano, named Toba, may have ejected(喷射)1 000
One fine day about 74 000 years ago, a giant volcano on Sumatra blew its top. The volcano, named Toba, may have ejected(喷射)1 000
admin
2015-07-31
56
问题
One fine day about 74 000 years ago, a giant volcano on Sumatra blew its top. The volcano, named Toba, may have ejected(喷射)1 000 times more rock and other material than Mount St. Helens in Washington state did in 1980. In the process, it cooled the climate by at least 10°C, causing a global famine.
Paleoclimate(古气候)evidence suggests that the Toba eruption, which occurred during the last ice age, emitted lots of sulfur dioxide—vastly more than Mount St. Helens did. The eruption also seems to have coincided with the start of a 1 000-year period of even colder temperatures. Some scientists have suggested that Toba caused the deep freeze and that perhaps such an event happening today could bring on a new ice age. But models developed by National Aeronautics and Space Administration and the National Center for Atmospheric Research in Boulder, Colorado, argue otherwise.
Researchers led by climatologist Alan Robock of Rutgers University in New Brunswick, New Jersey, ran scenarios that featured eruptions producing up to several times more sulfur dioxide than Toba. The result, published 27 May in the Journal of Geophysical Research—Atmospheres, was a cooler climate that lasted only a few decades. So the 1 000-year cold spell was probably part of the natural cycle that has produced more than a dozen ice ages over the past couple of million years.
"The results virtually eliminate mega(非常大的)volcanic eruptions as one of the key drivers of global-scale glaciation," says climatologist Ellen Mosley-Thompson of Ohio State University in Columbus, who was not involved in the study. So, paleoclimatologists should focus on more likely climate coolers, she says, such as changes in ocean circulation or cyclical variations in Earth’s orbit around the sun.
Still, if Toba erupted today like it did in the past, the results would be catastrophic. Although the volcano isn’t expected to blow its top for thousands of years, Robock and colleagues estimate a megaeruption could lower global temperatures by as much as 17°C for several years, followed by a recovery to normal conditions that could take decades. That would hit the human population with the double whammy of dramatically reduced agricultural production and widespread loss of vegetation, leading to widespread food shortages and starvation.
What are the results of the eruption of Toba if it happened today?
选项
A、It could affect the Earth for thousands of years.
B、Its influence on climate and human would last for many years.
C、It could take no time for the human population to recover.
D、Many kinds of plants would disappear forever.
答案
B
解析
细节辨认题。由定位段可知,一次特大规模的多巴火山爆发会给气候和人类带来很多年的影响,因此B)为正确答案。
转载请注明原文地址:https://kaotiyun.com/show/rrl7777K
0
大学英语四级
相关试题推荐
WhyTeenagersReallyDoNeedanExtraHourinBed?A)"Makingteensstartschoolinthemorningis’cruel’,"braindoctorclaim
A、Itusuallyrequiresananalysisoffinancialdemand.B、Itiscomposedofresearchandgraduatetypes.C、Itsamountrangesfrom
A、Peoplewithexcellentqualities.B、Peoplewithdesiretobeleaders.C、Peoplewithspecialpersonalability.D、Peoplewithyea
A、Peoplequittheirmothertonguebutspeakinotherlanguages.B、Kidsdon’tlearnthelocallanguageoftheirparentsanymore.
Americaischangingitseatinghabits.Asmedicalevidencemountsthatweareindeedwhatweeat,consumingahealthierdiethas
TheEndoftheBook?A)Amazon,byfarthelargestbooksellerinthecountry,reportedonMay19thatitisnowsellingmorebook
SevenWaystoSavetheWorldA)Forgettheoldideathatconservingenergyisaformofself-denial—ridingbicycles,dimmingthe
SevenWaystoSavetheWorldA)Forgettheoldideathatconservingenergyisaformofself-denial—ridingbicycles,dimmingthe
Onefinedayabout74000yearsago,agiantvolcanoonSumatrablewitstop.Thevolcano,namedToba,mayhaveejected(喷射)1000
随机试题
A.10%葡萄糖酸钙B.地塞米松C.10%氯化钾D.10%葡萄糖E.毛花苷禁忌静脉推注的药物是
泡腾性颗粒剂的特点是( )。
要增大化合物的脂溶性,在药物分子中可引入的基团有
沥青混合料中沥青含量试验有()。
公路工程流水施工按施工段在空间分布形式可分为()。
关于投行并购业务的描述,错误的是()。
有A、B、C、D四个有实力的排球队进行循环赛(每个队与其他队各比赛一场),比赛结果为:B队输掉一场,C队比B队少赢一场,而B队又比D队少赢一场。关于A队的名次,下列哪一项为真?
Whyis【S1】fun?Whatdelightsmayitspractitionerexpectashisreward?Firstinthesheerjoyofmakingthings.Asthechilddeligh
窗口事件是指操作窗口时所引发的事件。下列事件中,不属于窗口事件的是
A、Egypt,GreeceandRome.B、TheMediterranean.C、Itshighwayfortradeanddiplomacy.D、AllthelandsontheshoresoftheMedit
最新回复
(
0
)