首页
登录
职称英语
Scientists studying the effect of large volcanic eruptions on global
Scientists studying the effect of large volcanic eruptions on global
游客
2024-01-11
42
管理
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. [br] Which of the following best describes the organization of the third paragraph of the passage?
选项
A、A theory is proposed, considered, and then amended.
B、Opposing views are presented, elaborated, and then reconciled.
C、A problem is described, then a solution is discussed and its effectiveness is affirmed.
D、A view is advanced, then refuted, and an alternative is suggested.
E、A hypothesis is presented, qualified, and then reaffirmed.
答案
D
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3352839.html
相关试题推荐
Somepeoplebelievethatthemostimportantqualitiesofaneffectiveteacherar
SOPORIFIC:A、effectualtreatmentB、falsesustenanceC、tonicD、illusoryeventE、su
Currentestimatesputthirteenpercentofglobalfloraatriskofextinction,bu
Althoughsomescientists______thecredibilityoftheworkoftheirassistants,
Scientistshavelongsoughtthereasonsfortherelativelyyoungageof
A、Theinfluenceofvolcaniceruptionsonglobalweatherpatternsisalmostcompl
A、ThedeepandenduringeffectthatvolcaniceruptionshaveontheenvironmentB
Scientistshaveacknowledgedthattointerpretananimal’sthoughtprocessesin
A、Asmallpopulationwithlowconsumptionrates,consideredgloballyB、Alargep
A、entirelysuperfluousB、globallyconsistentC、notwhollyexplanatoryD、supremel
随机试题
Whatistheconversationmainlyabout?[originaltext]W:Whatareyoudoing?M:I
编辑加工题:阅读分析短稿,并按照稿件加工整理的规范进行编辑加工。 温家宝总理在
干式系统发生火灾时,火源周围环境温度上升,闭式喷头受热后开启喷水,水流指示器动作
依据《企业职工伤亡事故分类》(GB6441),转炉生产主要事故类别不包括()
家庭风险保障项目中的长期项目包括()。 Ⅰ.贷款还款 Ⅱ.子女教育金
下列关于影响贷款价格的因素的说法,正确的有( )。A.当贷款供大于求时,银行贷
某药品零售企业于2011年6月取得《药品经营许可证》。 该药品零售企业的《
下列选项中,关于循证医学基本知识的叙述,错误的是()。A.循证医学与传统医
营养性维生素D缺乏性佝偻病进一步检查
麻疹合并肺炎时应隔离至出疹后A.5天B.21天C.7天D.10天E.14天
最新回复
(
0
)