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
2025-05-09
28
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] What determines the rate at which a molecule of water moves through the cycle, as discussed in the third paragraph?
选项
A、The potential energy contained in water.
B、The effects of atmospheric pressure on chemical compounds.
C、The amounts of rainfall that fall on the continents.
D、The relative size of the water storage areas.
答案
D
解析
蓄水区相对的体积。根据第三段第一句,水分子通过的周期的速度并不是任意的,但是能测出许多蓄水区相对的体积。
转载请注明原文地址:https://tihaiku.com/zcyy/4068666.html
相关试题推荐
Asa______major,heenjoyedworkinginthesteelplant.A、metallurgyB、geology
Overheadrailway,(whose)tracks(areelevatedoutof)thewayofsurfacetraffi
Althoughthe"online"lifestylehasdominatedthemajorityofcityyouth,most
ThegeologyoftheEarth’ssurfaceisdominatedbytheparticularproperties
ThegeologyoftheEarth’ssurfaceisdominatedbytheparticularproperties
ThegeologyoftheEarth’ssurfaceisdominatedbytheparticularproperties
TheUnitedStatesFoodandDragAdministrationhasshownitselftobeparticular
Someresearchersfeelthatcertainpeoplehavenervoussystemsparticularly____
Manhasbecomemasteroftheearth’ssurface.Heisconstantlyprobinginto
Manhasbecomemasteroftheearth’ssurface.Heisconstantlyprobinginto
随机试题
To:AlldepartmentmanagersFrom:MollyStuartDate:16October2009Subject:In
HemustgiveUSmoretime,______weshallnotbeabletomakeagoodjobofit.
质量策划的重点应放在()的策划,策划过程应与施工方案、施工部署紧密结合。A.工
关于成本的描述,正确的是( )。A.在投资决策时应避免受到沉没成本的干扰 B
疑为化脓性脑膜炎,辅助检查中最有价值的是A.脑脊液中白细胞数降低 B.脑脊液中
2012年8月,有“史上最严‘限抗令’”之称的《抗菌药物临床应用管理办法》正式实
受训者从培训项目中学到了一些基本原理和方式方法,这种培训成果属于()A.技能成果
制作顺序量表的方法有( )A.差别阈限法 B.数量估计法 C.等级排列法
有关多剂量给药血药浓度的波动程度表述不正确的是A.有效血药浓度范围很窄的药物,血
诊断甲亢的首选实验室检查是 A.FT3、FT4 B.TT3、TT4 C
最新回复
(
0
)