In the Weddell Sea, off 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.

　　4l. What does the passage mainly discuss?

　　(A) The elements of salt

　　(B) The bodies of water of the world

　　(C) The many forms of ocean life

　　(D) The salinity of ocean water

　　42. The word this in line 5 refers to

　　(A) ocean

　　(B) evaporation

　　(C) salinity

　　(D) crystals

　　43. According to the passage, the ocean generally has more salt in

　　(A) coastal areas

　　(B) tropical areas

　　(C) rainy areas

　　(D) turbulent areas

　　44. All of the following are processes that decrease salinity EXCEPT

　　(A) evaporation

　　(B) precipitation

　　(C) runoff

　　(D) melting

　　45. Which of the following statements about the salinity of a body water can best be

　　inferred from the passage?

　　(A) The temperature of the water is the most important factor.

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