Paragraph 1 A difference among the world's seas and oceans is that the salinity (varies in different climate zones.The Baltic Sea(波罗的海)in Northern Europe is only one-fourth as saline (as the Red Sea in the Middle East.There are reasons for this.In warm climates,water evaporates rapidly.The concentration (of salt is greater.The surrounding land is dry and does not contribute much fresh water to dilute (the salty sea water.In cold climate zones,water evaporates slowly. The runoff created by melting snow adds a considerable amount of fresh water to dilute the saline sea water. Paragraph 2 Another difference among the world's seas and oceans is that the salinity varies in different climate zones.For example,the Baltic Sea in Northern Europe is only one- fourth as saline as the Red Sea in the Middle East.There are two reasons for this First of all,in warm climate zones,water evaporates rapidly;therefore,the concentration of salt is greater.Second,the surrounding land is dry and, consequently,does not contribute much fresh water to dilute the salty sea water.In cold climate zones,on the other hand,water evaporates slowly.Furthermore,the runoff created by melting snow adds a considerable amount of fresh water to dilute the saline sea water.Paragraph 1 A difference among the world’s seas and oceans is that the salinity（盐度）varies in different climate zones. The Baltic Sea（波罗的海）in Northern Europe is only one-fourth as saline（咸的） as the Red Sea in the Middle East. There are reasons for this. In warm climates, water evaporates rapidly. The concentration（浓缩）of salt is greater. The surrounding land is dry and does not contribute much fresh water to dilute（稀释）the salty sea water. In cold climate zones, water evaporates slowly. The runoff created by melting snow adds a considerable amount of fresh water to dilute the saline sea water. Paragraph 2 Another difference among the world’s seas and oceans is that the salinity varies in different climate zones. For example, the Baltic Sea in Northern Europe is only one￾fourth as saline as the Red Sea in the Middle East. There are two reasons for this. First of all, in warm climate zones, water evaporates rapidly; therefore, the concentration of salt is greater. Second, the surrounding land is dry and, consequently, does not contribute much fresh water to dilute the salty sea water. In cold climate zones, on the other hand, water evaporates slowly. Furthermore, the runoff created by melting snow adds a considerable amount of fresh water to dilute the saline sea water