首页
登录
职称英语
The geology of the Earth’s surface is dominated by the particular properties
The geology of the Earth’s surface is dominated by the particular properties
游客
2025-04-02
21
管理
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. [br] 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
定位第二段第一句“Evaporated from…the continents”可得知,云是蒸发后形成,故答案为C。
转载请注明原文地址:http://tihaiku.com/zcyy/4023610.html
相关试题推荐
Pupilsoftenwanttositnexttotheirparticularfriendandmanyclassroomacti
Oneoftheimportantpropertiesofascientifictheoryisitsabilityto______f
Doyouwantmetodothisinanyparticularwayorwithspecialcare,orcanId
Youngpeopleareparticularlyinterestedinfilmsdescribing______storiesinwhi
Theoceansformthe______oftheearth’ssurface.A、bulkB、majorityC、bodyD、main
Doeshappinessfavorthoseofaparticularage,sex,orincomel
Doeshappinessfavorthoseofaparticularage,sex,orincomel
Doeshappinessfavorthoseofaparticularage,sex,orincomel
Doeshappinessfavorthoseofaparticularage,sex,orincomel
Aparticularareainwhichassumptionsandvaluesdifferbetweenculturesis
随机试题
Lookattheformbelow.Youwillhearamancallingaboutapart-timejob.
[originaltext]Anewstudysaysawidely-usedinsecticideisdamagingwildb
用增强石膏空心条板或水泥玻纤空心条板(GRC板)作为轻质隔墙,墙体高度一般限制为
关于岩体的强度性质,以下说法正确的是()。A:在任何情况下,岩体的强度既不等于
符合其他境外金融机构作为金融租赁公司发起人应具备的条件的有()。A.最近
我国西北地区盛产苹果、梨、红枣、核桃等特色农产品,电商企业从西北地区采购农产品,
碱性成分在下列何种条件下大部分易分配于有机溶剂中A.pH=7 B.pH<3
站用交流电源系统精益化评价细则中,要求备自投装置的电源应由(____)供电。直流
下列关于后任注册会计师主动与前任注册会计师沟通的事项描述中,不恰当的有()
建设工程施工阶段,为加快施工进度可采取的组织措施是()A、采用更先进的施工机械
最新回复
(
0
)