Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions:
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 salt 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.
A third process by which salinity may be altered is associated with the formation and melting of sea ice. When seawater is frozen, the dissolved materials are left behind. In this manner, seawater directly beneath freshly formed sea ice has a higher salinity than it did before the ice appeared. Of course, when this ice melts, it will tend to decrease the salinity of the surrounding water.
In the Weddell Sea, off Antarctica, the densest water in the ocean 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.
Why does the author mention the Weddell Sea?
Hãy suy nghĩ và trả lời câu hỏi trước khi xem đáp án
Lời giải:Báo sai
Kiến thức: Đọc hiểu
Tại sao tác giả đề cập đến biển Weddell?
Để chỉ ra rằng vùng nước này có các biến đổi độ mặn
Để so sánh vùng biển Nam Cực với vùng biển Bắc Cực
Để chỉ ra vị trí của vùng nước sâu
Để đưa ra một ví dụ về độ mặn của nước lạnh
Thông tin: In the Weddell Sea, off Antarctica, the densest water in the ocean is formed as a result of this freezing process, which increases the salinity of cold water.
Tạm dịch: Ở biển Weddell, ngoài khơi Nam Cực, nước dày đặc nhất trong đại dương được hình thành là kết quả của quá trình đóng băng này, làm tăng độ mặn của nước lạnh.