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
财经
When we analyze the salt salinity(盐浓度)of ocean waters, we find that it varies only slightly from place to place. Nevertheless, s
When we analyze the salt salinity(盐浓度)of ocean waters, we find that it varies only slightly from place to place. Nevertheless, s
admin
2015-04-08
34
问题
When we analyze the salt salinity(盐浓度)of ocean waters, we find that it varies 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. In this manner, the salinity is increased, since the salt stays behind. If this is carried to the extreme, of course, white salt would be left behind; this, by the way, is how much of 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 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.
Normally, in hot 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, the densest water in the ocean 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 portion of the oceans of the world.
Which of the following is not the cause of the decrease in the oceanic salinity?
选项
A、Precipitation.
B、Rain and snow.
C、Formation of ice.
D、Addition of water by rivers.
答案
C
解析
本题采用排除法。根据第二段“The opposite of evaporation is precipitation…so that thesalinity is decreased.”,“in areas of high rainfall”和“in coastal regions where rivers flow into the ocean”可以排除A、B、D项,答案选C。
转载请注明原文地址:https://kaotiyun.com/show/JNgc777K
本试题收录于:
英语题库银行系统招聘考试分类
0
英语
银行系统招聘考试
相关试题推荐
实验室烧杯内有盐水溶液若干。现在往烧杯内加入若干纯净水后测得浓度是40%,然后再加入同样多的纯净水,测得浓度是30%,那么,如果再加入同样多的纯净水,溶液的浓度是()。
有浓度来知的溶液500克,蒸发了若干水分之后,浓度变为10%,然后加入300克浓度为4%的同种溶液,测得浓度变为6.4%。问:最开始溶液的浓度是多少?()
Wereitnotfortelevision,wetheeventsthatarehappeninginotherplaces.
ForgetTwitterandFacebook,GoogleandtheKindle.Televisionisstillthemostinfluentialmedi—umaroundIndeed,notmanyofthe
Internet,aswellasnewspapersandmagazines,_________animportantpartinourdailylife.
Whenweanalyzethesaltsalinity(盐浓度)ofoceanwaters,wefindthatitvariesonlyslightlyfromplacetoplace.Nevertheless,s
Todaytelevisionisoneofthemostpopularformsofentertainmentinthehome.Somepeopleinplaceswheretelevisionreception
Themassmediainfluencesall【C1】______ofourlives,includingthelearningof【C2】______roles.Newspapersandmagazines,televis
Cultureisoneofthemostchallengingelementsoftheinternationalmarketplace.Thissystemoflearnedbehaviorpatternschara
随机试题
用右偏刀从外缘向中心进给车端面时,若床鞍没紧固,车出的表面会出现()。
(2017年)随着商品经济的繁荣。两宋时期的买卖、借贷、租赁、抵押、典卖、雇佣等各种契约形式均有发展。据此。下列哪一说法是错误的?()
下列选项中,属于行政诉讼决定适用范围的有()。
预提费用和待摊费用是根据以下哪项原则设置的会计科目()。
上海证券交易所买断式回购的交易按照( )原则进行。
基金托管人的首要职责是()。
阅读下面宋词,然后回答问题。鹊桥仙.七夕范成大双星良夜,耕慵织懒,应被群仙相妒。娟娟月姊满眉颦,更无奈、风姨吹雨。
请示是公文中的一种,它的特点不包括()。
Winecanbemadewithredgrapesorwhitegrapes,and,especiallyinthecaseofredwines,anumberofmedicalresearchershave
A、Thelongerpeoplestayawayfromtobacco,thehealthiertheyare.B、Longtimesmokershavehigherriskofsufferingfromheart
最新回复
(
0
)