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) of ocean water is analyzed, it is found to vary only slightly from place to place. Nevertheless, some of th
If the salinity(含盐量) of ocean water is analyzed, it is found to vary only slightly from place to place. Nevertheless, some of th
admin
2013-03-11
51
问题
If the salinity(含盐量) of ocean water 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. This, by the way, is the way the table salt we use is actually obtained.
The opposite of evaporation is precipitation, 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(流量).
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.
选项
A、Subtract water from the ocean through evaporation.
B、Add water to the ocean through precipitation.
C、Dissolve materials in the ocean through heating.
D、Convert water vapor into liquid water.
答案
A
解析
细节题。在文章开头有一段话: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.这段话告诉我们食用盐就是利用这种蒸发(evaporation)方式形成的。
转载请注明原文地址:https://kaotiyun.com/show/Ohr7777K
0
大学英语四级
相关试题推荐
A、1/2.B、1/3.C、1/4.D、2/3.AHowmanycollegestudentsintheUnitedStatesworkwhiletheyarestudying?
Timeandhowweexperienceithavepuzzledphysicistswhohavecreatedfascinatingtheories.Buttheirtimeismeasuredbyapen
Theteacher______expectshisstudentstopasstheuniversityentranceexamination.
NewresearchconductedbybrainresearcherAviKarnioftheUniversityofHaifainIsraelexploresthepossibilitythatnapshel
NewresearchconductedbybrainresearcherAviKarnioftheUniversityofHaifainIsraelexploresthepossibilitythatnapshel
Thetouristindustryhasplayedapositiverolein____________(满足公众的文化需求),carryingforwardnationalcultureandachievingthes
______,manylawsofnatureactuallyexist.
NaturalgasVehiclesKermittheFrogoncesaid,"It’snotthateasybeinggreen."Althoughhewasn’treferringtocars,hiso
A、Theyinvented"Fijitime"forvisitors.B、Theysticktoatraditionalwayoflife.C、Theyliketotravelfromplacetoplace.
随机试题
微博营销以微博为营销平台,每个关注者都是潜在的营销对象,企业利用更新微博向网友传播企业、产品信息,树立企业形象和产品形象。微博营销的特点是立体化、高速度、便捷性和广泛性。根据以上定义,下列属于微博营销的是()。
最有助于癫痫诊断的辅助检查是
哺乳指导中下述哪项不妥
分离汉防己甲素和汉防己乙素,可利用
A、泻药与雌激素B、喹诺酮类抗生素C、四环素类抗生素D、氨基糖苷类抗生素E、适量的维生素、铁、钙等小儿服用后可能引致骨骼损伤的是
已知短期国库券利率为6%,纯粹利率为5%,市场利率为8%,则通货膨胀补偿率为()。
We’reallkeepingour______crossedthatthesurgeonsdonotfindanythingtooseriouswiththepatient.
张某家住北京市东城区,在朝阳区有一处商业用房,市拆迁办(在西城区)决定对其房屋拆迁,张某不服,诉至法院,应由()受理。
Changesinresidenceandjobsplaceatremendousamountofstressandpressureonpeople【1】theytrytoadjustthemselvestonew
RenownedChinesedirectorZhangYimou’slatestfilm,RidingAloneforThousandsofMiles,heldatrialpremiereinthesouthern
最新回复
(
0
)