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
0
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] All of the following are examples of soluble ions EXCEPT______.
选项
A、magnesium
B、iron
C、potassium
D、calcium
答案
B
解析
定位文章第四段第二行“soluble ions such as…transported”,A、C、D都有出现而只有B没有出现。
转载请注明原文地址:https://tihaiku.com/zcyy/4023613.html
相关试题推荐
Asa______major,heenjoyedworkinginthesteelplant.A、metallurgyB、geologyC、
Althoughthemodellooksgoodonthesurface,itwillnotbearclose______.(2015
Someresearchersfeelthatcertainpeoplehavenervoussystemsparticularly_____
Doeshappinessfavorthoseofaparticularage,sex,orincomel
Doeshappinessfavorthoseofaparticularage,sex,orincomel
Doeshappinessfavorthoseofaparticularage,sex,orincomel
Doeshappinessfavorthoseofaparticularage,sex,orincomel
Doeshappinessfavorthoseofaparticularage,sex,orincomel
Doeshappinessfavorthoseofaparticularage,sex,orincomel
Doeshappinessfavorthoseofaparticularage,sex,orincomel
随机试题
A.techniqueB.processesC.testedD.procedure
______peoplesay,Ibelieveheisinnocent.A、WheneverB、HoweverC、WhoeverD、Wha
[originaltext]BarbaraSandersisawifeandthemotheroftwochildren,ages
CircleTHREElettersA-F.WhatdoesCharlessayabouthisfriends?(A)Hemetthe
Whatdoesthewomanimplyabouthercar?[originaltext]M:Isthistableinthec
Internetuseappearstocauseadropinpsychologicalhealth,accordingtor
如图所示,梯形的上底和下底分别为5厘米、18厘米,两条腰分别为5厘米、12厘米,
国内甲公司在A、B两国独资建立公司,安全控制在两个国家公司的整个管理和销售,独立
根据《建设工程监理规范》GB/T50319-2013,关于工程进度控制的具体措
检测胎儿肺是否成熟的指标为 通过抽取羊水,检测羊水中的 A.甲胎蛋白 B.
最新回复
(
0
)