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
56
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.
According to the passage, clouds are primarily formed by water______.
选项
A、precipitating onto the ground
B、changing from a solid to a liquid state
C、evaporating from the oceans
D、being carried by wind
答案
C
解析
事实细节题。由文章第二段第一句“Evaporated from the oceans,water vapor forms clouds”可知,从海洋蒸发出的水蒸气形成云。选项C与此信息一致。故答案为C。
转载请注明原文地址:https://kaotiyun.com/show/ZHGO777K
0
考博英语
相关试题推荐
Theworkerschoseto______theirdissatisfactioninaseriesofstrikes.(复旦大学2011年试题)
我们现在面临的所有重大世界性问题中最重要的问题就是人口对土地和土地资源的压力正存迅速增长。
Inmoderndays,onthewesternbankoftheupperTigrisRiverstandsanIraqicitycalledQal’atShartlat.Thousandsofyearsag
Thetwoarticlesarousesuspicion.Thetheory?Thenovel?Sincethereisnosuchthingasthenovel,howcantherebeasinglet
Onebillionpeopleintheworldareshortofwater.Howcanthisproblembesolved?Somesuggestionshavebeentodesalinate(除去盐
Schoolbuildingsthemselvescanreflectliberalorconservativeviewsaboutwhatshouldgooninaclassroom.Theearliestschoo
Thelong-termfortunesofthemodemeconomydependinpartonthestrengthandsustainabilityofthefamily,bothinrelationto
Encouragedbythepolicythatfostersautomarketforthecountry’sover200millionfamilies,automotivetradingcompanieshave
Iwasunawareofthecriticalpointsinvolved,somychoicewasquite______.
Thisbringsafeelingofemptinessthatcanneverbefilledandleavesuswitha______formore.
随机试题
关于股份有限公司发行股份的说法,错误的是()。
管理作为一门科学诞生的标志是()
国家与私人垄断资本在企业外部结合的内容包括()
女,39岁。婚后8年未避孕未怀孕,月经规律,痛经重。月经来潮12小时子宫内膜活检为分泌期子宫内膜,B超下通液输卵管通而不畅。男方精液化验精子数6200万/ml,活力60%。最可能的诊断是
产权比率是负债对权益之比。该比率越低,偿债的保障程度越高,所以企业应尽量降低产权比率。()
建立和完善广泛的统一战线,是建立、巩固和发展人民民主专政制度的重要保障。下列各项不属于宪法中定义的爱国统一战线组成部分的是()。
[*]
下列描述的现象中,哪一个是由于进程P1、P2因申请不同类资源而产生死锁的现象?()
Booch方法认为软件开发是一个螺旋上升的过程。在上升的每个周期中,都经过下列几步Ⅰ.发现类和对象Ⅱ.确定类和对象的定义Ⅲ.确定对象之间的关系Ⅳ.确定每个界面的类与对象正确的顺序是()。
数字视频(及其伴音)在嵌入式系统中使用或在互联网上传输时,其文件格式有多种。下面几种文件格式中不属于数字视频文件格式的是()。
最新回复
(
0
)