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
2015-01-09
52
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 are 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-atmospheres,continent,and ocean-we see that the times are very different. A water molecule stays,on 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 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
题目问:云彩是怎样形成的?第二段第一句“Evaporated from the oceans,water vapor forms clouds”,通过这段话可知,海洋里的水蒸发,形成水蒸气构成云彩。据此判断,应选择C。
转载请注明原文地址:https://kaotiyun.com/show/UYQO777K
0
考博英语
相关试题推荐
Classroomtesting,ifwelldone,mostcertainly______astimulustostudyandreallearning.
Theteacherwas______bothinhismarkingofhomeworkandalsoinhistreatmentofoffenders.
Hereisagreatironyof21st-centuryglobalpublichealth;Whilemanyhundredsofmillionsofpeoplelackadequatefoodasare
TomorrowJapanandSouthKoreawillcelebrateWhiteDay,anannualeventwhenmenareexpectedtobuyagiftfortheadoredwome
InJune2006,inMinato,Tokyo,a16-yearoldhighschoolstudentwaskilledbyaSchindlerelevator.Hewasbackingoutofitw
Medicalstudentslearntodistinguish"acute,"whichmeanssomethingofrecentonset,from"chronic,"whichmeansaconditionth
Alllivinglanguages______,andEnglishseemstochangemorereadilythansomeothers.
Bigcitiestodayareconfrontedwithveryseriousproblems.Transportisa【1】difficulty:someplannersbelievein【2】transportsy
Bigcitiestodayareconfrontedwithveryseriousproblems.Transportisa【1】difficulty:someplannersbelievein【2】transportsy
随机试题
先吃糖,后喝苦药,就会觉得药更苦体现
正常成人安静时的双肾血流量约为
李某与张某为邻居,因李某笑话张某才30岁就掉了大量头发,像个老头,张某便将李某打成重伤,经及时抢救,李某才脱离生命危险,治疗期间共花去医药费、交通费以及误工损失约3万元。公安机关对张某立案侦查,经人民检察院审查,向人民法院提起公诉。关于本案,请回答下列问题
仲裁与诉讼的共同点在于()。
公益活动是指一定的组织或个人向社会捐赠财物、时间、精力和知识等活动。公益活动的内容包括社区服务、环境保护、知识传播、公共福利、帮助他人、社会援助、社会治安、紧急援助、青年服务、慈善、社团活动、专业服务、文化艺术活动、国际合作等。根据上述定义,下列属于公益活
现在的人对雾霾很重视,的确,雾霾会损害我们的呼吸系统,如果我们不下大力气加以解决,后果很严重。然而,我们很少注意另一种雾霾——无力感。这样的雾霾一点一点侵蚀着社会公平的底线,让我们产生挫败感、埋怨心。这种挫败感、埋怨心积累到一定程度就会转化为戾气,成为萌生
判断改革得失成败的标准是
A、杂志B、成绩单C、报名表D、日记本B
Noiseconstitutesarealandpresentdangertopeople’shealth.Dayandnight,athome,atwork,andatplay,noisecanproduce
A、Heshouldbecarefulwhenusinghiscreditcards.B、Heoughttosellhiscartosavemoney.C、Heshouldstopspendingmoneyon
最新回复
(
0
)