首页
登录
职称英语
One fine day about 74,000 years ago, a giant volcano on Sumatra blew its top
One fine day about 74,000 years ago, a giant volcano on Sumatra blew its top
游客
2023-06-19
17
管理
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 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 mega eruption 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. [br] What was the disastrous consequence of the Toba eruption?
选项
A、The low temperature made global people freeze to death.
B、The rock and other material caused by the eruption buried numerous people.
C、The great change of climate resulted in the food shortage.
D、The flames caused by the volcano eruption burned down Sumatra.
答案
C
解析
由题干中的consequence of the Toba eruption定位到第一段最后一句。推理判断题。由定位句可知,在多巴火山喷发的过程中,气温至少下降了10℃,引起了全球性的饥荒。由此可以推知,气候变冷使得食物短缺,导致全球饥荒,因此C)为正确答案。
转载请注明原文地址:https://tihaiku.com/zcyy/2763881.html
相关试题推荐
[originaltext]MountEtnaisoneofthemostactivevolcanoesonEarth.Themoun
[originaltext]MountEtnaisoneofthemostactivevolcanoesonEarth.Themoun
[originaltext]MountEtnaisoneofthemostactivevolcanoesonEarth.Themoun
[originaltext]MountEtnaisoneofthemostactivevolcanoesonEarth.Themoun
[originaltext]Thousandsofpeoplelivinginvillagesclosesttothevolcano
[originaltext]Thousandsofpeoplelivinginvillagesclosesttothevolcano
Onefinedayabout74,000yearsago,agiantvolcanoonSumatrablewitstop
Onefinedayabout74,000yearsago,agiantvolcanoonSumatrablewitstop
Onefinedayabout74,000yearsago,agiantvolcanoonSumatrablewitstop
Onefinedayabout74,000yearsago,agiantvolcanoonSumatrablewitstop
随机试题
Therapidgrowthofurban【11】willputheavypressureonpublichealth,fresh
Ofalltheareasoflearningthemostimportantisthedevelopmentofattitu
Throughouthistory,manhashadtoacceptthefactthatalllivingthingsmu
运动员达到高水平运动成绩所需要的年限是确定少儿早期专项化训练要考虑的因素之一。(
大吞噬细胞是指A.T淋巴细胞 B.淋巴细胞 C.中性粒细胞 D.单核-巨噬
选择教育金信托的客户有()。A.有大额整笔资金的家庭 B.单亲家庭
三萜皂苷元结构的共同特点是都有A.30个碳原子B.一般不含有羧基C.6个甲基D.
(2012年)依照《外国的组织或者个人来华测绘管理暂行办法》的规定,外国的组织或
Thechangeinthatvillagewasmiraculou
银行承兑汇票的承兑银行,应当按照票面金额向出票人收取()的手续费。A:千分之一
最新回复
(
0
)