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
25
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://jikaoti.com/ti/gnWYFFFM
本试题收录于:
GRE VERBAL题库GRE分类
0
GRE VERBAL
GRE
相关试题推荐
Imagineaschoolthatexpecteditsstudentstobecomeliteratewithoutanyformalinstruction.Mostparentswouldbealarmedby
Ican’ttellthe______differencebetweenthetwinsisters.
AhandwrittennotefromAlbertEinsteinsoldformorethan$1.5millionatanauction(拍卖会).Hegavethenotetoahotelporter
AreportconsistentlybroughtbackbyvisitorstotheUSishowfriendly,courteousandhelpfulmostAmericansweretothem.To
DESSICATE:LIQUID::
IMPROMPTU:
IMPROMPTU:REHEARSED::
DIATRIBE:
Tobelievethataculture’sachievementcanbemeasuredbythe(i)______ofitswrittenmaterialrequiresonetoacceptthatap
ECO-TOURISMIfyoustillbelievetheonce-commonlyheldmisconceptionthattourismisonlyanindulgenceforthewealthy,yo
随机试题
2016年1月,母公司将成本为30000元的存货以32000元的价格销售给子公司,子公司当年售出60%,则2016年年末编制合并财务报表时,应抵销存货中未实现内部销售损益是【】
A.腹会阴联合直肠癌根治术B.经腹直肠癌切除术C.经腹直肠癌切除、人工肛门、远端封闭术D.拉下式直肠癌切除术E.乙状结肠造口术直肠癌病人发生急性肠梗阻时适用
急性心肌梗死患者疼痛缓解后出现四肢厥冷、脉快细弱、血压仍然下降、尿少或无尿表现时,应考虑发生了
A.矢状线B.冠状线C.正中线D.水平线E.垂直线与人体水平面垂直的线
患者,女,58岁。脑动脉硬化6年。突然发生口眼歪斜,半身不遂,半小时后,自行恢复;平日头晕头痛,耳鸣,腰膝酸软,舌红,苔薄黄,脉弦细。应首先考虑的方剂是
混凝土搅拌和养护用水要求错误的是()
某外商投资企业自挪威购进钢铁制法兰。2009年2月4日货物运抵首都机场,向首都机场海关申请转关运输,于2月6日货物转运至指运地天津塘沽并于当日向海关申报。进口申报前,该公司已经海关核准以保函形式向海关提供担保。进口报关单“征免性质”栏填报为“自有资金”,“
老子曰:“见欲而止为德。"请根据这句话。结合当前公安干警在战线上的道德修养来发表你的看法。
采取强制的、暴力的手段制服正在实施暴力犯罪的犯罪分子;对付犯罪分子的暴力反抗、拒捕、报复、袭击等;在处理治安案件或事件中受到不法分子的殴打伤害等,这体现了公安工作的()
Whenyouhavetomeetsomeonefromadifferentculture,beprepared.Ifyouunderstandculturaldifferences,you’llbeabetter
最新回复
(
0
)