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
Scientists studying the effect of large volcanic eruptions on global climate have long focused on the major quantities of
Scientists studying the effect of large volcanic eruptions on global climate have long focused on the major quantities of
admin
2011-01-17
68
问题
Scientists studying the effect of large volcanic eruptions on global climate
have long focused on the major quantities of carbon dioxide (C02), a gas known
to contribute to the greenhouse effect, produced by these eruptions. It is well
Line observed that such greenhouse gases trap heat radiated from the surface of the
(5) earth, thereby forming a type of insulation around the planet. The greenhouse
effect is essential for ecological equipoise because it maintains the temperature
of the planet within habitable parameters, but there is growing concern that
man-made production of gases such as CO~ from the burning of fossil fuels may
be threatening the system’s tolerance, and have resulted in excessive warming
(10) on a global scale.
While volcanic eruptions indubitably metabolize and accumulate C02 in the
atmosphere, it has been recently discovered that their impact is virtually trivial
compared to the quantity produced by human activities, especially heavy
industry. In reality, the more substantive climatic effect from volcanoes results
(15) from the production of atmospheric haze, whereby large eruption columns inject
ash particles and sulfur-rich gases into the troposphere and stratosphere, clouds
that circumscribe the globe within weeks of the volcanic activity. Ash and
aerosol clouds from large volcanic eruptions disseminate quickly through the
atmosphere, and the small ash particles decrease the amount of sunlight
(20) reaching the surface of the earth and lower average global temperatures, while
the sulfurous gases combine with water in the atmosphere to form acidic
aerosols that also absorb incoming solar radiation and scatter it back out into
space.
There is evidence that volcanoes’ stratospheric ash clouds has a lesser
(25) effect on global temperatures than aerosol clouds, given that the major Mt. St.
Helens eruption had lowered global temperatures by about 0.1 degree C, while
two years later the much smaller eruption of El Chico had, by contrast, three to
five times the global cooling effect worldwide. Despite its smaller ash cloud, El
Chico emitted more than 40 times the volume of sulfur-rich gases produced by
(30) Mt. St. Helens, revealing that the formation of atmospheric sulfur aerosols has
a more substantial effect on global temperatures than simply the volume of ash
produced during an eruption. Sulfate aerosols appear to necessitate several
years to settle out of the atmosphere, one of the reasons their effects are so
widespread and enduring. This corroborates the opinion of those scientists who
(35) argue that without the cooling effect of major volcanic eruptions such as E1
Chico, global warming effects caused by human activities would be far more
substantial. It should be noted that major volcanic eruptions have additional
climatic effects beyond global temperature decreases and acid rain, for ash and
aerosol particles suspended in the atmosphere scatter light of red wavelengths,
(40) often resulting in brilliantly colored sunsets and sunrises around the world.
The passage suggests that the effects of volcanic carbon dioxide on the environment differ from those of sulfurous gases in that
选项
A、carbon dioxide tends to alleviate environmental haze, while sulfurous gases usually increase it
B、carbon dioxide tends to increase temperatures by trapping sunlight, while sulfurous gases tend to decrease temperatures by blocking it
C、carbon dioxide tends to have an effect on the environment, while sulfurous gases for the most part do not
D、sulfurous gases have played an even more significant role than carbon dioxide in pushing environmental temperatures outside the habitable range
E、sulfurous gases tend to decrease the level of solar radiation outside the earth’s atmosphere, while carbon dioxide plays only a negligible role
答案
B
解析
转载请注明原文地址:https://kaotiyun.com/show/GJjO777K
本试题收录于:
GRE VERBAL题库GRE分类
0
GRE VERBAL
GRE
相关试题推荐
FloresColquecelebratedher118thbirthdaylastmonth.SheistheoldestwomaninBolivia(玻利维亚).Followingthedeathofawoman
Inadequacyofenergyresourcesormoreoftenofthetechnologiesandorganizationsforharvesting,converting,anddistributing
Haveyoueverheardofapawpaw(木瓜)?Ifnot,donotfeelbad.ManyAmericansdonotknowofthefruit,althoughitisnativeto
Previous______hisdeparture,headdressedalettertohisdaughter.
Incollege,Iencounteredaruleofthumb:Foreverycredithourperweek,youshouldbestudyingtwotothreehours【C1】________
AnAmericanmanufacturerofracingbikesreporteda1996second-quartergrossincomeof$18million,comparedwith$11.5million
Unlikeahurricane,whichcanbeobservedfromwithin,atornadoissosmallthatsuchastudyhasnotbeenpractical.
BernardBailynhasrecentlyreinterpretedtheearlyhistoryoftheUnitedStatesbyapplyingnewsocialresearchfindingsonthe
MERITOCRACY:ACHIEVEMENT::
ASSUAGE:
随机试题
关于磨耗描述哪项是不正确的
关于信用证支付,下列说法错误的是?()
根据《建设工程安全生产管理条例》,下列关于施工现场生产安全事故应急救援预案的规定,说法错误的是()。
以下符合借贷记账法记账规则的有()。
公司经济区位分析的主要内容包括()。Ⅰ.公司所处区位内的经济特色Ⅱ.公司所处区位内的自然条件Ⅲ.公司所处区位内的基础条件Ⅳ.公司所处区位内政府的产业政策
智慧以一定的知识为前提,在人的思考和实践中体现出来,但它本身是不稳定的、非规范性的,表现为某种洞幽烛微、触类旁通、融会贯通、举重若轻的能力。知识可以让人按照已有的方式思考和行动,智慧则使人立足已知探索未知,善于发现问题、提出问题、分析问题,进而自主地、创造
你市有小报报道称本市超市和农贸市场的大米重金属超标。有致癌的风险,造成市民的恐慌。经查证,该消息是虚假新闻。领导让你处理此事,请问你怎么办?
求
Healthimpliesmorethanphysicalfitness.Italsoimpliesmentalandemotionalwell-being.Anangry,frustrated,emotionally【C1
A、 B、 C、 A
最新回复
(
0
)