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
2025-04-06
24
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] The word "efficiency" in line 21 is closest in meaning to______.
选项
A、relationship
B、growth
C、influence
D、effectiveness
答案
C
解析
词义推断题。选项effectiveness与efficiency词根相同,由此可知答案为C。
转载请注明原文地址:https://tihaiku.com/zcyy/4029116.html
相关试题推荐
Althoughthe"online"lifestylehasdominatedthemajorityofcityyouth,most
Alwaysatthebeginningofanyparticularhunttherewasonesolemnceremony
Thislittlegirlhasaparticular_____forchocolate.Wheneversheseesit,shewil
Painting,theexecutionofformsandshapesonasurfacebymeansofpigment
Painting,theexecutionofformsandshapesonasurfacebymeansofpigment
Painting,theexecutionofformsandshapesonasurfacebymeansofpigment
Painting,theexecutionofformsandshapesonasurfacebymeansofpigment
Painting,theexecutionofformsandshapesonasurfacebymeansofpigment
Painting,theexecutionofformsandshapesonasurfacebymeansofpigment
Painting,theexecutionofformsandshapesonasurfacebymeansofpigment
随机试题
(Walking)inthestreet,thecarsandbuses(arerunning)(like)(streams).A、Wal
FixingaWorldThatFostersObesityA)WhyareAmericansgett
ThethemeofWorldNoTobaccoDayin2003is"Tobacco-FreeFilms,Tobacco
设计题目:单层工业厂房改建社区休闲中心设计 任务要求 1.原有单层工业厂
关于医院内感染知识培训,错误的叙述是()A.培训内容包括管理知识和专业知识
凡律令该载不尽事理,若断罪而无正条者,引律比附。应加应减,定拟罪名,转达刑部,议
假设其他条件不变,我国东北灾害性天气的出现,将对下列哪些期货合约价格造成影响?(
《医疗事故处理条例》规定,医疗机构发生下列重大医疗过失行为,应当在12小时内向所
下列( )是货物进境后、放行结关前.经海关批准可将其全部退运境外的货物. A
所谓噪声敏感建筑物,是指()、住宅等需要保持安静的建筑物。A.医院 B.学校
最新回复
(
0
)