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
The geology of the Earth’s surface is dominated by the particular properties of water. Present on Earth in solid, liquid, and ga
The geology of the Earth’s surface is dominated by the particular properties of water. Present on Earth in solid, liquid, and ga
admin
2016-02-26
72
问题
The geology of the Earth’s surface is dominated by the particular properties of water. Present on Earth in solid, liquid, and gaseous states, water is exceptionally reactive. It dissolves, transports, and precipitates many chemical compounds and is constantly modifying the face of the Earth.
Evaporated from the oceans, water vapor forms clouds, some of which are transported by wind over the continents. Condensation from the clouds provides the essential agent of continental erosion: rain. Precipitated onto the ground, the water trickles down to form brooks, streams, and rivers, constituting what is called the hydrographic network. This immense polarized network channels the water toward a single receptacle: an ocean. Gravity dominates this entire step in the cycle because water tends to minimize its potential energy by running from high altitudes toward the reference point that is sea level.
The rate at which a molecule of water passes through the cycle is not random but is a measure of the relative size of the various reservoirs. If we define residence time as the average time for a water molecule to pass through one of the three reservoirs—atmosphere, continent, and ocean—we see that the times are very different. A water molecule stays, on an average, eleven days in the atmosphere, one hundred years on a continent and forty thousand years in the ocean. This last figure shows the importance of the ocean as the principal reservoir of the hydrosphere but also the rapidity of water transport on the continents.
A vast chemical separation process takes places during the flow of water over the continents. Soluble ions such as calcium, sodium, potassium, and some magnesium are dissolved and transported. Insoluble ions such as aluminum, iron, and silicon stay where they are and form the thin, fertile skin of soil on which vegetation can grow. Sometimes soils are destroyed and transported mechanically during flooding. The erosion of the continents thus results from two closely linked and interdependent processes, chemical erosion and mechanical erosion. Their respective interactions and efficiency depend on different factors.
What determines the rate at which a molecule of water moves through the cycle, as discussed in the third paragraph?
选项
A、The potential energy contained in water.
B、The effects of atmospheric pressure on chemical compounds.
C、The amounts of rainfall that fall on the continents.
D、The relative size of the water storage areas.
答案
D
解析
事实细节题。信息定位在文章第三段第一句“the rate at which a molecule of water passes throughthe cycle is not random but is a measure of the relative size of the various reservoirs”,由此可知水分子的循环率决定于多种存水库的相对大小,选项D中的water storage areas是the relative size of the variousreservoirs的同义表达。故答案为D。
转载请注明原文地址:https://kaotiyun.com/show/aHGO777K
0
考博英语
相关试题推荐
democracyovercomemodernplaceanticipateimaginationonlineregularperformaccessdif
democracyovercomemodernplaceanticipateimaginationonlineregularperformaccessdif
Thebraindrainofexpertsawayfromdevelopingcountrieswillgreatlyinfluencethesecountries’developmentof______industry.
Forthelast20yearsorsothesubjectofglobalwarminghas______heateddebateamongtheworld’sbrightestminds.
Onebillionpeopleintheworldareshortofwater.Howcanthisproblembesolved?Somesuggestionshavebeentodesalinate(除去盐
Humanityusesalittlelessthanhalfthewateravailableworldwide.Yetoccurrencesofshortagesanddroughtsarecausingfamin
StudentsoftheBerrySchoolforMountainChildrenhelpedpayfortheireducationbydoingpart-timelaborthatpertainedtothe
Iwasunawareofthecriticalpointsinvolved,somychoicewasquite______.
TheFrencheducationsystemisverydifferentfromtheEnglishoneinitsaims,itsorganizationanditsresults.TheFrenchchi
Everynightshelistenedtoherfathergoingaroundthehouse,lockingthedoorsandwindows.Shelistened:thebackdoorclosed
随机试题
截至2019年3月31日,证券业协会对证券公司2019年第一季度经营数据进行了统计。131家证券公司当期实现营业收入1018.94亿元,同比增长54.47%。其中,各主营业务收入分别为代理买卖证券业务净收入(含席位租赁)221.49亿元,同比增长
胶片未经曝光而显影加工处理后产生的密度称
心力衰竭的病机是本虚标实,其中标实不包括
在股指期货投资者适当性制度中,关于综合评估操作要求的概述,下列正确的有()。[2010年9月真题]
()通常由投资银行发行,该权证所认兑的股票不是新发行的股票,而是已在市场上流通的股票,不会增加股份公司的股本。
买进看涨期权的交易者,理论上讲其()。
某公司2006年主营业务收入1000万元,其他业务收入800万元,营业外收入200万元。2006年发生业务招待费15万元,且能提供有效凭证。根据企业所得税法律制度的规定,准予在税前抵扣的业务招待费为( )万元。
下列选项中,()反映了一国和地区商品经济的发育程度和总体经济实力。
教育改革的核心是()。
设X1,X2,…,X20为总体X~N(0,σ2)(α1>0)的简单随机样本,则服从t分布的是()
最新回复
(
0
)