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
36
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
InevertrustedhimbecauseIalwaysthoughtofhimassucha______character.
Ican_____youthattheanimalsarewellcaredforinourzoo,soyouneedn’tworryaboutthem.
In1866,sailorsonaGermanshipcalledPaulathrewabottlewithamessageintowatershundredsofmilesoffthewesterncoast
AhandwrittennotefromAlbertEinsteinsoldformorethan$1.5millionatanauction(拍卖会).Hegavethenotetoahotelporter
Andrewfittedanelectrictoycarwithhardrubberwheelsthathaddeeptreadsandplacedthecaronasmooth,flatsurface.And
RECLUSE:PRIVACY::
ANESTHETIC:INSENSIBILITY::
AlfredSchnittke’smusicalcompositionsare______:phrasesareclipped,brokenintosections,andsplitapartbylongrests.
TheFlavorIndustryA.Readthroughthenutritionalinformationonthefoodinyourfreezer,refrigeratororkitchenpantry,
随机试题
当归四逆汤所治厥逆的病机是
根据现行国家标准《建筑设计防火规范》(GB50016),关于疏散走道设置的说法,错误的有()。
A.维生素AB.维生素D2C.维生素D1D.维生素B2E.维生素B6
黄某和张某共同贩卖毒品,黄某被当场抓获并拘留,张某住逃。有关部门的下列哪一做法是正确的?()
工程施工过程中应当采取消防安全措施,下列说法中错误的是()。
安全事故发生后,现场有关单位和人员不得破坏事故现场、毁灭相关证据。有()原因时,需要移动事故现场物件的,应当做出标志,绘制现场简图并做出书面记录,妥善保存现场重要痕迹、物证。
固定资产盘亏,应先转入“待处理资产损溢”账户,批准处理后根据具体原因分别转入“管理费用”、“营业外支出”等账户。()
新保单的初始佣金有不同的表现形式,常用的形式包括( )。Ⅰ.每1000元保额支付A元佣金Ⅱ.首年度保费的B%Ⅲ.首年度保费的C%,且不超过每1000元保额支付D美元的总额Ⅳ.首年度保费的E%加上F元Ⅴ.趸缴保费的G%
单位安排职工到会议室听报告。如果每3人坐一条长椅,那么剩下48人没有坐;如果每5人坐一条长椅,则刚好空出两条长椅。听报告的职工有多少人?()
在一项集体比赛中,你带领的队伍进入了复赛。在比赛前你听到队员聊天。认为团队人员安排不合理。还有关于你的毫无根据的花边新闻。请问作为队长你该怎么办?
最新回复
(
0
)