首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
The geology of the Earth’s surface is dominated by the particular properties of water. Present on Earth in solid,liquid,and gase
The geology of the Earth’s surface is dominated by the particular properties of water. Present on Earth in solid,liquid,and gase
admin
2013-11-29
31
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 are 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 hvdrographic 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-atmospheres,continent,and ocean-we see that the times are very different. A water molecule stays,on 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 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.
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
题目问:下列哪项不属于速溶离子?根据第四段“Soluble ions such as calcium,sodium,potassium,and some magnesium are dissolved and transported.Insoluble ions such as aluminum,iron,and siliconstay where they are and form the thin,fertile skin of soil on which vegetation can grow.”通过这段话可知,可溶性离子如钙、钠、钾、镁,不可溶离子是铁、铝。据此判断,应选择B。
转载请注明原文地址:https://kaotiyun.com/show/cfhO777K
0
考博英语
相关试题推荐
ArecenthistoryoftheChicagomeat-packingindustryanditsworkersexamineshowtheindustrygrewfromitsappearanceinthe
EINinoisthetermusedfortheperiodwhenseasurfacetemperaturesareabovenormalofftheSouthAmericancoastalongtheeq
EINinoisthetermusedfortheperiodwhenseasurfacetemperaturesareabovenormalofftheSouthAmericancoastalongtheeq
InTheDisunitingofAmerica:ReflectionsonaMulticulturalSociety,RevisedandEnlargedEdition(W.W.Norton)Schlesingerpr
InTheDisunitingofAmerica:ReflectionsonaMulticulturalSociety,RevisedandEnlargedEdition(W.W.Norton)Schlesingerpr
FeweventsinmodernJapan’srecenthistoryhavebeenanticipatedwithgreaterinterestandexpectationthantheso-called"Bi
AccordingtoarecentpublicationoftheEqualEmploymentOpportunityCommission,atthepresentrateofprogress,itwilltake
Ourpresentgenerationofculturalcritics,arrivingaftertheassaultofpostmodernismandtheincreasinglywidespreadcommerci
Ourpresentgenerationofculturalcritics,arrivingaftertheassaultofpostmodernismandtheincreasinglywidespreadcommerci
随机试题
对低钾患者静脉补钾,最重要的是()。
在临床用药前必须做皮肤过敏试验的药物是
北方寒冷地区采用轻型井点降水时,井点管与集水总管连接应用()。[2014年真题]
交易商协会不接受注册的,企业可于( )个月后重新提交注册文件。
中国证监会对基金管理公司进行日常监管的主要方式包括( )。
关于资产负债率评价,下列选项中表述最严谨的是()。
商业银行的最高风险管理和决策机构是()。
1843年,魏源在《海国图志》中提出的思想主张是()
Everyprofessionortrade,everyart,andeverysciencehasitstechnicalvocabulary,thefunctionof【C1】______ispartlyto【C2】_
TheMexicaneconomywentoffacliffinthesecondthreemonthsof2009,withthegrossdomesticproduct【B1】______10.3percent
最新回复
(
0
)