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
职业资格
The geology of the Earth’s surface is dominated by the particular properties of water. Present on Earth in solid, liquid, and ga
The geology of the Earth’s surface is dominated by the particular properties of water. Present on Earth in solid, liquid, and ga
admin
2022-12-06
57
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 are 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 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 place 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.
The first paragraph mainly________.
选项
A、talks about the various forms water exists on the Earth
B、details how our geology is dominated by chemical compounds and water
C、discusses the importance of water to Earth
D、explains the relationship between water and different chemical compounds
答案
C
解析
主旨题。第一段提到了水对地球表面的影响,即水不断地改变地球表面。A项“讨论地球上水的不同存在形式”和D项“解释水和不同化合物之间的关系”过于片面;B项“详细解释我们的地质是如何被化合物和水影响的”,第一段并没有详细介绍,details表述错误。故本题选C项“讨论水对于地球的重要性”。
转载请注明原文地址:https://kaotiyun.com/show/yOjD777K
本试题收录于:
英语学科知识与教学能力题库教师资格分类
0
英语学科知识与教学能力
教师资格
相关试题推荐
“长江是中国第一长河,名列世界第三”。这句话运用的逻辑方法是()。
小明今年15岁,初中二年级,与哥哥小鹏相依为命。后小鹏入伍参军,在一次对敌作战中不幸牺牲,被批准为烈士。按照规定,小明应向哪个部门领取定期抚恤金?()
Whatisthefocuswhenateachersaystotheclass"Rewriteeachofthefollowingsentencesusingthepassivevoice."?
Becauseofthestrongsun,thenewdrawing-roomcurtainshave________fromdarkbluetogrey.
Whichofthefollowingwordshasadifferentstresspattern?
Whichofthefollowingdescribesthelanguagephenomenonthatabilingualspeakerusestwolanguagesalternativelyinthesamec
WhichofthefollowingshowstheproperpronunciationoftheEnglishconsonantgroup"spl"intheword"splash"?
Businessesthrowaroundtheterm"innovation"toshowthey’reonthecuttingedgeofeverythingfromtechnologyandmedicineto
Whatisateachertryingtodowhenhe/sheasksstudentstodescribewhattheyknowaboutpolicemenbeforereadingastoryabout
Howshouldoneinvestasumofmoneyinthesedaysofinflation?Leftinabankitwillhardlykeepitsvalue,howeverhighthe
随机试题
受理申请医师注册的卫生行政部门除执业医师法第15条规定的情形外,应当自收到申请之日起多少日内准予注册,并发给由国务院卫生行政部门统一印制的医师执业证书
龋病的药物治疗中使用药物不包括
初产妇,26岁,孕33周,四步触诊结果为于子宫底部触到坚而硬的胎头,在耻骨联合上方触到较软面宽不规则的胎臀,胎背位于母体腹部右前方,胎心音于脐上右侧听到,该孕妇胎方位为()
送修灭火器时,一次送修数量不得超过计算单元配置灭火器总数量的()
()的交易对象主要是标准化期货合约。
甲公司拟自建一条生产线,与该生产线建造相关的情况如下:(1)2014年1月1日,甲公司发行公司债券专门筹集生产线建设资金,该公司债券为3年期,系分期付息、到期还本的债券,面值总额为3000万元,票面年利率为5%,发行价格为307.0万元;另在发行过程中支
货币政策是政府调控宏观经济的基本手段之一,当通货膨胀较为严重时,应该采取的货币政策是()
已知线性方程组(Ⅰ)a,b为何值时,方程组有解?(Ⅱ)方程组有解时,求出方程组的导出组的一个基础解系;(Ⅲ)方程组有解时,求出方程组的全部解.
下列关于对象"更新前"事件的叙述中,正确的是( )。
Complainingaboutfaultygoodsorbadservicearenevereasy.【M1】______Mostpeopledislikemakingafuss.Butifsome
最新回复
(
0
)