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
考研
Glaciers consist of fallen snow that compresses over many years into large, thickened ice masses. Most of the world’s glacial ic
Glaciers consist of fallen snow that compresses over many years into large, thickened ice masses. Most of the world’s glacial ic
admin
2020-03-21
100
问题
Glaciers consist of fallen snow that compresses over many years into large, thickened ice masses. Most of the world’s glacial ice is found in Antarctica and Greenland, but glaciers are found on nearly every continent, even Africa. Presently, 10% of land area is covered with glaciers. Glacial ice often appears blue because ice absorbs all other colors but reflects blue. Almost 90% of an iceberg is below water; only about 10% shows above water. What makes glaciers unique is their ability to move. Due to sheer mass, glaciers flow like very slow rivers. Some glaciers are as small as football fields, whereas others grow to be over 100 kilometers long.
Within the past 750, 000 years, scientists know that there have been eight Ice Age cycles, separated by warmer periods called interglacial periods. Currently, the earth is nearing the end of an interglacial, meaning that another Ice Age is due in a few thousand years. This is part of the normal climate variation cycle. Greenhouse warming may delay the onset of another glacial era, but scientists still have many questions to answer about climate change. Although glaciers change very slowly over long periods, they may provide important global climate change signals.
The girth of the ice, combined with gravity’s influence, causes glaciers to flow very slowly. Once a mass of compressed ice reaches a critical thickness of about 18 meters thick, it becomes so heavy that it begins to deform and move. Ice may flow down mountains and valleys, fan across plains, or spread out to sea. Movement along the underside of a glacier is slower than movement at the top due to the friction created as it slides along the ground’s surface.
Most glaciers are found in remote mountainous areas. However, some found near cities or towns present a danger to the people living nearby. On land, lakes formed on top of a glacier during the melt season may cause floods. At the narrow part of a valley glacier, ice falling from the glacier presents a hazard to hikers below. When ice breaks off over the ocean, an iceberg is formed.
Glaciers are a natural resource and contain 75% of the world’s freshwater. People worldwide are trying to harness the power of these frozen streams. Some towns rely on glacial melting from a nearby ice cap to provide drinking water. Some farmers spread soil or ashes over snow to promote melting, hoping that the melting will provide water to irrigate crops in drought-stricken areas. Others have channeled meltwater from glaciers to their fields. Scientists and engineers have worked together to tap into glacial resources, using electricity that has been generated in part by damming glacial meltwater.
According to the passage, where can glaciers be found?
选项
A、Only on Antarctica.
B、Only Greenland and Alaska.
C、On nearly every continent.
D、Only the north and south poles.
答案
C
解析
细节题。根据题干可以定位到第一段第二句后半部分。该句提到,几乎每个大陆都有冰川,甚至包括非洲。因此,正确答案为[C]。
转载请注明原文地址:https://kaotiyun.com/show/16Y4777K
0
考研英语二
相关试题推荐
Whichofthefollowingcanbethebesttitleofthispassage?Themainfunctionoftheliveristo______.
ThemajordifferencebetweennarrativesalesandsuggestivesalesisthatWhichofthefollowingisthebesttitleforthepass
Sportisheadingforanindissolublemarriagewithtelevisionandthepassivespectatorwillenjoyaprivateparadise.Allofth
MillionsofAmericansandforeignersseeG.I.Joeasamindlesswartoy,thesymbolofAmericanmilitaryadventurism,butthat’
In1999,thepriceofoilhoveredaround$16abarrel.By2008,ithad【1】the$100abarrelmark.Thereasonsforthesurge【2】fro
Priortothe20thcentury,manylanguageswithsmallnumbersofspeakerssurvivedforcenturies.Theincreasinglyinterconnected
KimiyukiSudashouldbeaperfectcustomerforJapan’scar-makers.He’sayoung,successfulexecutiveatanInternet-servicesco
KimiyukiSudashouldbeaperfectcustomerforJapan’scar-makers.He’sayoung,successfulexecutiveatanInternet-servicesco
Manufacturersofeverythingfromrunningshoestodeodorants,asubstancetoremoveunpleasantodors,designproductsspecifical
Speakingtwolanguagesratherthanjustonehasobviouspracticalbenefitsinanincreasinglyglobalizedworld.Butinrecentye
随机试题
手工电弧焊安全操作技术要求有哪些?
A、指压法B、加压包扎法C、屈曲肢体加垫止血法D、止血带止血法E、填塞止血法适用于四肢大动脉出血的止血方法是()
出现大便隐血试验阳性。其上消化道出血量至少达到的数量是
35kV及以上供电电压正、负偏差的绝对值之和不超过标称系统电压的()。
按承受载荷的不同,能传递扭矩的轴应是()。
根据《中国居民膳食营养素参考摄入量》,成人每日维生素C的推荐摄入量为()mg。
有的教师认为,既然科学的内容十分广泛,那么选择什么内容也就无所谓了,而有的教师则认为可以无限制地增加学习内容。这是没有正确理解()。
由所给资料计算出2008年美元对人民币的年平均汇率为()。2008年居民消费价格比2003年上涨了()。
近年来离婚率普遍偏高。为防止盲目离婚,某区民政局实行限号离婚制度。每天只办理10~15对夫妻的离婚业务。一段时间后。离婚率确实有所下降。对此你怎么看?
在风险监控过程中,下列()不是此过程的主要工作内容。
最新回复
(
0
)