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
If the salinity (含盐量) of ocean waters is analyzed, it is found to vary only
游客
2023-06-28
44
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 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] Coastal regions are mentioned as cases where _____.
选项
A、sea water is less salty because fresh water joins in
B、rivers carry industrial exhaust into sea
C、sea ice tends to melt more quickly than in the center of oceans
D、heavy water sinks to the deeper portions of the oceans
答案
A
解析
推理判断题。coastal regions字眼在文章中提到两遍,分别在第2段第3句及第3段最后一句。只要能够迅速查找到任何一处均可做出正确判断为A。B和C无原文支持;D张冠李戴,原文提及D内容涉及的是Weddell Sea,而非coastal regions。
转载请注明原文地址:https://tihaiku.com/zcyy/2788851.html
相关试题推荐
Ifthesalinity(含盐量)ofoceanwatersisanalyzed,itisfoundtovaryonly
Ifthesalinity(含盐量)ofoceanwatersisanalyzed,itisfoundtovaryonly
Ifthesalinity(含盐量)ofoceanwatersisanalyzed,itisfoundtovaryonly
Ifthesalinity(含盐量)ofoceanwatersisanalyzed,itisfoundtovaryonly
Ifthesalinity(含盐量)ofoceanwatersisanalyzed,itisfoundtovaryonly
Ifthesalinity(含盐量)ofoceanwatersisanalyzed,itisfoundtovaryonly
Ifthesalinity(含盐量)ofoceanwatersisanalyzed,itisfoundtovaryonly
Ifthesalinity(含盐量)ofoceanwatersisanalyzed,itisfoundtovaryonly
Ifthesalinity(含盐量)ofoceanwatersisanalyzed,itisfoundtovaryonly
Ifthesalinity(含盐量)ofoceanwatersisanalyzed,itisfoundtovaryonly
随机试题
YouMakeotherpeoplealittlehappy.[br]Youareafraidofsomething.G你害怕某事。wor
WhywasMarthasohappythismorning?[originaltext]W:Morning,dad!M:Martha,
国外的游客们可以在除上海、北京这些主要的大城市(metropolises)之外的其他地方寻找让人兴奋的中国地道美食(delicacy)。在2010年被联
Lookingforanewweightlossplan?Trylivingontopofamountain.Mountai
肺炎球菌的毒力因子主要是()A.脂多糖B.荚膜C.外膜蛋白D.脂寡糖E.溶血素
与强直性脊柱炎最具相关性的选项是 A、B7 B、B13 C、B27
乌梅丸在加减应用时治疗心下疼热甚者应加A.使君子、苦楝根皮 B.川楝子、白芍
国家认证认可监督管理委员会统一管理全国标准化工作。( )
投资项目决策分析与评价的基本要求包括贯彻落实科学发展观、资料数据准确可靠和()
哪类降压药兼有改善肾功能、心功能,逆转心脏肥大,并能明显降低病死率A.利尿降压药
最新回复
(
0
)