首页
登录
职称英语
If the salinity (含盐量) ocean waters is analyzed, it is found to vary only sli
If the salinity (含盐量) ocean waters is analyzed, it is found to vary only sli
游客
2023-07-24
49
管理
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. [br] The best title of the passage can be _________.
选项
A、Typical Oceans and Their Respective Features
B、The Causes of the Changes in Salinity of Ocean Water
C、Different Oceans Have Different Salinity
D、The Precipitation and Evaporation of Oceans
答案
B
解析
本文第3句是全文的主题句,告诉读者三种致使海洋盐分变化的原因,并逐一介绍这三种原因,选项 B比较全面地归纳了本文的主题。
转载请注明原文地址:https://tihaiku.com/zcyy/2863979.html
相关试题推荐
Ifthesalinity(含盐量)oceanwatersisanalyzed,itisfoundtovaryonlysli
Ifthesalinity(含盐量)oceanwatersisanalyzed,itisfoundtovaryonlysli
Ifthesalinity(含盐量)oceanwatersisanalyzed,itisfoundtovaryonlysli
Ifthesalinity(含盐量)oceanwatersisanalyzed,itisfoundtovaryonlysli
Ifthesalinity(含盐量)oceanwatersisanalyzed,itisfoundtovaryonlysli
Ifthesalinity(含盐量)ofoceanwatersisanalyzed,itisfoundtovaryonlysl
Ifthesalinity(含盐量)ofoceanwatersisanalyzed,itisfoundtovaryonlysl
Ifthesalinity(含盐量)ofoceanwatersisanalyzed,itisfoundtovaryonlysl
Ifthesalinity(含盐量)ofoceanwatersisanalyzed,itisfoundtovaryonlysl
Ifthesalinity(含盐量)ofoceanwatersisanalyzed,itisfoundtovaryonlysl
随机试题
Weget(clever)______aswegetolder.cleverer随着年龄的增长,我们变得越来越聪明。本句要求形容词的比较级。
BeautyandBodyImageintheMediaA)Imagesoffemalebodies
WhydidNorthernEuropeanpeoplecometosettledownintheUnitedStates?[br]
简述教师角色。
A.1.8 B.2 C.2.2 D.2.4
一国在进行国际经济交往时,其国际收支比较理想的状态是()。A.经常项目收大于支
购买经济适用住房满一定期限后,购房人方可依法转让。()
1924年1月,中国国民党一大在广州召开,大会通过的宣言对三民主义作出了新的解释
流动负债是指将在1年(含1年)或者超过1年的一个营业周期内偿还的债务。( )
拖拉架梁一般用于( )钢梁的架设,就施工方法上大体可分为纵拖和横移两类。A.小
最新回复
(
0
)