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
9
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
Iwas13whenBenjicameintoourlives.Withhisdeepbrowneyes,floppyea
"Shetakes______herfatherclosely,saidthesurprisedneighborwhohasnots
检疫期确定是根据该传染病的( )。A.隔离期 B.传染期 C.最长潜伏期
A.镇静催眠药B.胆碱受体拮抗剂C.胆碱受体激动剂D.肾上腺素受体拮抗剂E.肾上
共用题干 男婴,7个月,近两个月来肤色苍白,食欲减退入院。生后一直人工喂养,未
关于急性呼吸衰竭的描述,下列哪项是错误的A.各种累及呼吸中枢或呼吸器官的疾病导致
各种运输方式内外部的各个方面的构成和联系,就是( )。 A.运输系统
简述现代企业人力资源管理各个历史发展阶段的特点。
基金评级不只是对基金本身的评价,还可以兼顾到对基金公司投资能力的评价。()
A. B. C. D. E.图中来源于姜科,药用部位为干燥成熟果实的是(
最新回复
(
0
)