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1、智课网TOEFL备考资料托福写作真题范文赏析（独家版）摘要： 托福写作真题范文赏析!托福写作的高分范文，可以作为考生的参考范例，通过这些高分范文的学习，让我们了解高分的秘籍所在。赶快来欣赏吧。The Salinity of Ocean WatersIf the salinity 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 bas
2、ic 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
3、 crystals of salt would be left behind.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.
4、 Thus salinity may be increased by the subtraction of water by evaporation, or decreased by the addition of fresh water by precipitation or runoff.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 n
5、ot 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 sea water is frozen, the dissolved materials are le
6、ft behind. In this manner, sea water directly materials are left behind. In this manner, sea water 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
7、Weddell Sea 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.以上就是为大家整理的 托福 写作真题范文赏析，希望通过这些范文的赏析，能够提高大家的写作水平，早日写出优美的写作范文。相关推荐历年新托福写作机经题目范文大集合(独立+综合)新托福写作真题库及范文完整收录新托福写作真题及范文汇总(20132014)相关字搜索： 托福写作真题
