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
公务员
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
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
admin
2014-02-25
46
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(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.
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 coulee,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
要使海水的盐浓度变小,可以通过Precipitation;Rain and snow;Addition of water by rivers等方式,只有Formation of ice是使海水的盐浓度变大的。故选C。
转载请注明原文地址:https://kaotiyun.com/show/L06q777K
本试题收录于:
中学英语题库教师公开招聘分类
0
中学英语
教师公开招聘
相关试题推荐
在数学教学中,__________教学模式适用于教师诱导全班学生发现预定目标的情形.
______sendforadoctorisstillaquestion.
Whatdoyouwanttobewhenyougrowup?Ateacher?Adoctor?Howaboutanice-creamtaster?Yes,therereallyisajobwher
Oneafternoon,mysonAdamaskedme,"Areallpeoplethesameeveniftheyaredifferentincolor?"Ithoughtforaminute,
Ihaven’tseenSarasinceshewasalittlegirl,andshehaschangedbeyond______.
Theexperimenthas______thepossibilityoftheexistenceofanylifeonthatplanet,butitdoesnotmeanthereisnolifeonot
Tomwasdisappointedthatmostoftheguests______whenhe______attheparty.
Forthispart,youareallowedtowriteanEnglishcompositionaccordingtothefollowingtitleHandwritingLettersWon’tDisapp
Withlotsofwoundedpeople,thequake-strickenareais______formedicalassistancenow.
Inthelastfewdecades,scientistshavereachedconsensusandreportedthathumanbeingsarecausingchangesintheEarth’scli
随机试题
一级智力残疾:IQ值在()
增溶的通常操作为
简述西周时期的婚姻制度。
海运提单根据提单是否可以流通分为()。
基金管理公司或基金代销机构使用基金宣传材料违规的情形不包括()。
根据民事诉讼法律制度的规定,下列有关反诉的表述中,不正确的是()。
小金同学是位热心于公众事业的人,自2011年12月底开始,他每年都要向一位失学儿童捐款。小金向这位失学儿童每年捐款1000元,帮助这位失学儿童从小学一年级读完九年义务教育。假设每年定期存款年利率都是2%,则小金9年的捐款在2019年底相当于多少钱?已知(F
两位老师对学生进行英语学习的元认知策略训练,两人共同讨论、评课、写教案。请问两位老师采用的研究方法是()。
教师心理健康的标准包括()。
例如:为了让自己更健康,他每天都花一个小时去锻炼身体。★他希望自己很健康。(√)今天我想早点儿回家。看了看手表,才5点。过了一会儿再看表,还是5点,我这才发现我的手表不走了。★那块手表不是他的。(×)
最新回复
(
0
)