托福写作是让很多人头疼的一项，大家在备考托福时也要多多的参考范文来积累素材，让脑子有一个正确思路的模型。我们要学习托福写作中的思路，并在日后在托福写作考试中加以修改运用。今天为大家准备的托福写作范文是：海水盐度。
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托福写作范文之海水盐度的内容，更多资料请继续关注百利天下考试。
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