在托福写作中自己构思固然重要，但是在备考托福写作的过程中看看托福写作范文，并从中分析托福写作的优缺点也是十分重要的。本次前程百利小编要和大家分享的就是一片托福写作范文，希望可以帮助大家取得好成绩！
The Salinity of Ocean Waters 海水盐度
If 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 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, 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. 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 not as much evaporation. Similarly, in coastal regions where rivers dilute the sea, salinity is somewhat lower than in other oceanic areas.
以上就是小编为大家整理的“toefl写作范文下载之海水盐度”部分内容，希望能够帮助大家有一个更加明了的认识。如果想了解更多考试资讯，下载更多备考资料，欢迎登陆前程百利论坛，最后预祝每一位考生都能考出好成绩。
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