海洋占覆盖地球表面的水域的97％以上,海水的量约占地球水圈的一半以上。 海洋水与陆地水的本质不同不仅在于体积,而且在于组成。每升海水平均溶有35克盐,而陆地淡水中盐的浓度通常不超过1—2克/升。 虽然在海水中实际上含有元素周期表中的所有元素,但溶于海水中的盐的主体则只有11 Oceans account for more than 97% of the water that covers the Earth’s surface, and the amount of seawater accounts for more than half of the Earth’s hydrosphere. The essence of ocean water and terrestrial water differs not only in volume but also in composition. 35 grams of salt are dissolved per liter of sea level, whereas the concentration of salt in fresh water on land is usually no more than 1-2 grams / liter. Although in the sea water actually contains all the elements of the periodic table, the main body of the salt dissolved in the seawater is only 11