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
If the salinity (含盐量) ocean waters is analyzed, it is found to vary only slightly from place to place. Nevertheless, some of the
If the salinity (含盐量) ocean waters is analyzed, it is found to vary only slightly from place to place. Nevertheless, some of the
admin
2010-08-04
24
问题
If the salinity (含盐量) ocean waters is analyzed, it is found to vary only slightly from place to place. Nevertheless, some of these small changes are important. There are three basic processes that cause a change in oceanic salinity. One of these is the subtraction of water from the ocean by means of evaporation--conversion of liquid water to water vapor. In this manner, the salinity is increased, since the salts stay behind. If this is carried to the extreme, of course, white crystals of salt would be left behind.
The opposite of evaporation is precipitation (降水), such as rain, by which water is added to the ocean. Here the ocean is being diluted (稀释) so that the salinity is decreased. This may occur in areas of high rainfall or in coastal regions where rivers flow into the ocean. Thus salinity may be increased by the subtraction of water by evaporation, or decreased by the addition of fresh water by precipitation or runoff (形成地表水部分的降雨).
Normally, in tropical regions where the sun is very strong, the ocean salinity is somewhat higher than it is in other parts of the world where there is not as much evaporation. Similarly, in coastal regions where rivers dilute the sea, salinity is somewhat lower than in other oceanic areas.
A third process by which salinity may be altered is associated with the formation and melting of sea ice. When seawater is frozen, the dissolved materials are left behind. In this manner, seawater directly beneath freshly-formed sea ice has a higher salinity than it did before the ice appeared. Of course, when this ice melts, it will tend to decrease the salinity of the surrounding water.
In the Weddell Sea, off Antarctica, the densest water in the oceans is formed as a result of this freezing process, which increases the salinity of cold water. This heavy water sinks and is found in the deeper portions of the oceans of the world.
Which of the following processes will increase salinity of ocean waters?
选项
A、Evaporation.
B、Precipitation.
C、Melting.
D、Dilution.
答案
A
解析
只要明白第5句中的in this manner是指第4句巾的evaporation,不难做出正确选择。
转载请注明原文地址:https://kaotiyun.com/show/JAA7777K
0
大学英语四级
相关试题推荐
A、Anindividual’sI.Q.canbeincreasedbyeducation.B、Anindividual’sI.Q.canbepredictedatbirth.C、Anindividual’sI.Q,
Manytreesandshrubschangecolorinfall.Threefactorsinfluencefall’scolorfulfarewell-leafpigments(色素),lengthofnight
A、Theconceptof"thefamily"asasocialunit.B、Theattitudestobirthcontrol.C、Theattitudestoreligion.D、Theideasofau
Thecomputerbringsboththe【B1】______anddangers.Thatmeansdangertophysicaland【B2】______well-beingofthepeoplewhowor
Therearetwotypesofpeopleintheworld.Althoughtheyhaveequaldegreesofhealthandwealthandtheothercomfortsoflife
Chinalauncheditssecondmannedspacemission.sendingtwoastronautsintoorbitasitopenedanew【B1】______initsambitiousd
A、Markthelatesthomeworkassignment.B、Putacancellationnoticeontheclassroomdoor.C、Makeanappointmentwiththedoctor.
Workerscomeandgoastheyplease.Theymakevitaldecisionspreviousmadebythebosses.Secretarieshavebeenabolished.The
Characterismadeupofthoseprinciplesandvaluesthatgiveyourlifedirection,meaninganddepth.Theseconstituteyourinne
A、Helikesthediscoparty.B、Henevermissesanydiscoparties.C、Helikesthediscobetterthananyotherthings.D、Hedislike
随机试题
证券市场监管的原则有()
由原发证机关注销《药品经营许可证》的情形不包括
某带转换层的框架一核心筒结构,抗震等级为一级;其局部外框架柱不落地,采用转换粱托柱的方式使下层柱距变大,如图6-24所示。梁、柱混凝土强度等级采用040(ft=1.71N/mm2),钢筋采用HRB335(fyv=300N/mm2)。试问:下列对转换梁
实验者是化学实验的主体,其根本属性是()。
根据下面材料回答下列问题。中关村上市公司协会公布的《2016年中关村上市公司竞争力报告》显示,2015年,中关村上市公司总营业收入达到2.34万亿元,同比增长28%。截至2015年年底,中关村E市公司总市值达到48175亿元,同比增幅54%,较2011年
数据16、18、20、22、17的平均差为
简述格雷欣法则及其在日常生活中的运用。
下面指令序列执行后完成的运算,正确的算术表达式是( )。 MOV AL,BYTE PTR X SHL AL,1 DEC AL MOV BYTE PTR Y,AL
下列有语法错误的赋值语句是( )。
Forthistask,youwillwritearesponsetoaquestionaboutareadingpassageandalecture.Youmaytakenotes,andyoumayuse
最新回复
(
0
)