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
43
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.
It can be known from the passage that increase in the salinity of ocean water is caused by______.
选项
A、melting of sea ice
B、precipitation
C、evaporation
D、supplement of salt
答案
C
解析
根据第一段“One of these is the subtraction of water from the ocean by means of evaporation.In this manner,the salinity is increased.”可知,答案为C,即海水蒸发可使盐度增加。
转载请注明原文地址:https://kaotiyun.com/show/DNgc777K
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
对气候变暖的治理应当是为二氧化碳找出路,而不仅仅是减少排放或简单地掩埋它。为此科学家提出富碳农业的理念,将人类活动特别是工业生产中产生的二氧化碳捕集后,以高于大气中二氧化碳含量几倍的浓度,释放在密闭的人造气候小区域中,利用相关科学技术,创造一个高效率的光合
杯中原有浓度为18%的盐水溶液100ml,重复以下操作2次,加入100ml水,充分融合后,倒出100ml溶液,则杯中盐水溶液的浓度变成了多少?()
Wereitnotfortelevision,wetheeventsthatarehappeninginotherplaces.
ForgetTwitterandFacebook,GoogleandtheKindle.Televisionisstillthemostinfluentialmedi—umaroundIndeed,notmanyofthe
Todaytelevisionisoneofthemostpopularformsofentertainmentinthehome.Somepeopleinplaceswheretelevisionreception
Todaytelevisionisoneofthemostpopularformsofentertainmentinthehome.Somepeopleinplaceswheretelevisionreception
Themassmediainfluencesall【C1】______ofourlives,includingthelearningof【C2】______roles.Newspapersandmagazines,televis
Themassmediainfluencesall【C1】______ofourlives,includingthelearningof【C2】______roles.Newspapersandmagazines,televis
Themassmediainfluencesall【C1】______ofourlives,includingthelearningof【C2】______roles.Newspapersandmagazines,televis
随机试题
关税
超声经腹诊断前置胎盘时,膀胱应
患者,男,32岁。工作时不甚从脚手架上坠落,头部受伤,一过性昏迷,头痛、呕吐急诊入院。为预防脑水肿,降低颅内压,护士应协助患者采取
对一般感染伤口进行紫外线照射时应采用
A.描述性研究B.病例对照研究C.队列研究D.实验性研究E.理论性研究
对于财政部代理发行地方政府债券的投标最高限额限定,下面说法正确的是()。
土地一旦被用于某种运输设施建设,就不能同时用于其他产品的生产或提供其他服务,这说明资源的使用会产生()。
某校学生参加秋游,如果每台车坐60人,则调15台车还不够,若每台车坐70人,则调14台车还空余。最后决定改乘面包车,每台可坐x人,只需调x台车正好坐满,共有多少师生参加秋游?()
Bigcompaniesswallowlittleoneseveryday.Sothe【C1】________onMarch25thbyYahoo(annualrevenue,$5billion)ofSummly,a
某系统的可靠性结构框图如图6-1所示。该系统由4个部件组成,其中2、3两部件并联冗余,再与1、4部件串联构成。假设部件2、3、4的可靠度分别为0.80、0.80、0.90。若要求该系统的可靠度不低于0.75,则进行系统设计时,分配给部件1的可靠度至少应为(
最新回复
(
0
)