首页
登录
职称英语
If the salinity(含盐量)of ocean waters is analyzed, it is found to vary only sl
If the salinity(含盐量)of ocean waters is analyzed, it is found to vary only sl
游客
2024-02-23
15
管理
问题
If the salinity(含盐量)of 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 carded 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/3475145.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
Theword"toufu"isa______one.A、clippedB、blendedC、derivedD、borrowedD“touf
AfricanEconomicGrowthA)GoodnewsforAfrica,saythe
[originaltext]W:Whatdidyouthinkaboutthemovie?M:Well...IthinkHarryP
下列各项中,能在销售预算中找到的内容有()。A.直接材料预算 B.变动制造费用
压力表测量的压力是()。A.绝对压力 B.标准大气压 C.真空度 D.
根据有效市场理论,下列属于证券市场外在效率衡量因素的有( )。A.与证券有关的信
患者,男,42岁,某公司采购员,长期出差在外。近三个月长期腹泻,每日稀便5~6次
公司基本分析不包括()。A:公司行业地位分析 B:公司经济区位分析 C:公司
(2013年真题)赵某2019年1月31日将自有住房出租,当月交付使
从客运结构演变的根本动因看,各种运输方式在()方面的差别是驱动客运结构演变的,主
最新回复
(
0
)