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
46
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 which of the following would be true if volcanic eruptions did not take place?
选项
A、The environment would likely contain fewer non-biodegradable pollutants, due to lesser quantities of sulfurous gases and ash clouds.
B、Greenhouse gas effects on rising global temperatures would likely be somewhat less worrisome than those postulated by scientists today.
C、Acid rain produced by heavy industry would likely be more of a problem than it currently is, given the tendency of volcanic eruptions to hasten atmospheric cycles.
D、Global warming effects caused by human activities would be far more substantial than they are today if volcanic cooling effects ceased to take place.
E、The environment would likely be cooler, for the atmosphere would contain fewer sulfurous gases and ash clouds.
答案
D
解析
转载请注明原文地址:https://kaotiyun.com/show/mJjO777K
本试题收录于:
GRE VERBAL题库GRE分类
0
GRE VERBAL
GRE
相关试题推荐
Amanisbeingquestionedinrelationtothe______murder.
In1866,sailorsonaGermanshipcalledPaulathrewabottlewithamessageintowatershundredsofmilesoffthewesterncoast
Acompletelynewsituationislikelyto______whentheschoolleavingageisraisedto16.
Monroe,despitehisgenerallypoorappetite,thoroughlyenjoyedthethreemealsheateattheTip-TopRestaurant,but,unfortuna
AthoroughsearchofEdgarAllanPoe’scorrespondencehasturnedupnotasingleletterinwhichhementionshisreputedmorphi
AmemberoftheBritishParliamentisreputedtohavesaid,"TheFirstpurposeofgoodsocialreformistoincreasethesumtota
Historianssometimesforgetthathistoryiscontinuallybeingmadeandexperiencedbeforeitisstudied,interpreted,andread.
BAROQUE:
SPICE:FLAVOR::
ASSUAGE:
随机试题
以下不属于绿茶功效的是
A.大刀螂B.银环蛇C.小刀螂D.五步蛇E.巨斧螳螂蕲蛇药材的原动物是
A.慢性规律性的上腹痛B.无规律性的上腹痛C.右上腹绞痛D.左上腹剧痛E.全腹剧痛胆道结石,常表现()
【2003年第147题】当地基土比较均匀时,单个高层建筑筏形基础的基底平面形心与在荷载效应准永久组合下的重心,其最大偏心距e宜符合下列哪一个计算值?(W为与偏心距方向一致的基础底面边缘抵抗矩,A为基础底面积)
关于多因素相互作用论,不正确的是()。
“谈笑有鸿儒,往来无白丁”中的“鸿儒”是指()。
A、 B、 C、 D、 D
对冲基金每年提供给它的投资者的回报从来都不少于25%。因此,如果这个基金每年最多只能给我们20%的回报的话,它就一定不是一个对冲基金。以下哪项的推理方法与上文相同?()
Therigidhigher-educationbusinessisabouttoexperienceawelcomeearthquake.Traditionaluniversitiesnowfaceanew【C1】____
数字彩色图像由大量像素组成,通常所说的真彩色图像可以有1600多万种不同的颜色,组成该图像的每个像素需采用【】个二进位表示。
最新回复
(
0
)