Câu hỏi:
31/10/2023 600
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: this, by the way, is how much of the table salt we use is actually obtained.
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 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.
What does the passage mainly discuss?
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: this, by the way, is how much of the table salt we use is actually obtained.
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 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.
What does the passage mainly discuss?
Đáp án chính xác
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Trả lời:
Giải bởi Vietjack
Đáp án D
Dựa vào câu mở đầu “If the salinity of ocean waters is analyzed, it is found to vary only slightly from place to place” và các thông tin được đề cập đến trong toàn đoạn văn → đoạn văn chủ yếu thảo luận về độ mặn của nước biển.
Câu hỏi cùng đoạn
Câu 2:
According to the passage, the ocean generally has more salt in
According to the passage, the ocean generally has more salt in
Đáp án chính xác
Lời giải của GV VietJack
Đáp án B
Thông tin trong bài “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”
→ biển thông thường sẽ có nhiều muối hơn ở những khu vực nhiệt đới.
Câu 3:
All of the following are processes that decrease salinity EXCEPT
All of the following are processes that decrease salinity EXCEPT
Đáp án chính xác
Lời giải của GV VietJack
Đáp án A
Thông tin trong bài “… salinity may be increased by the subtraction of water by evaporation, or decreased by the addition of fresh water by precipitation or runoff…” và “when this ice melts, it will tend to decrease the salinity of the surrounding water”
→ Các đáp án B, C, D đều được đề cập đến là quá trình làm giảm độ mặn
Câu 4:
Which of the following statements about the salinity of a body of water can best be inferred from the passage?
Which of the following statements about the salinity of a body of water can best be inferred from the passage?
Đáp án chính xác
Lời giải của GV VietJack
Đáp án D
Dựa vào các thông tin được đề cập trong đoạn văn → có thể suy ra rằng có nhiều nhân tố kết hợp lại để gây ra sự thay đổi lượng muối trong nước biển.
Câu 5:
The word "it" in line 16 refers to which of the following?
The word "it" in line 16 refers to which of the following?
Đáp án chính xác
Lời giải của GV VietJack
Đáp án C
Thông tin trong bài “… seawater directly beneath freshly formed sea ice has a higher salinity than it did before the ice appeared”
→ từ “it” chính là dạng thay thế của danh từ “seawater”
Câu 6:
Why does the author mention the Weddell Sea?
Why does the author mention the Weddell Sea?
Đáp án chính xác
Lời giải của GV VietJack
Đáp án C
Dựa vào thông tin đề cập trong đoạn cuối → tác giả đề cập đến biển Weddell để cho ví dụ về độ mặn của nước lạnh.
Câu 7:
Which of the following is NOT a result of the formation of ocean ice?
Which of the following is NOT a result of the formation of ocean ice?
Đáp án chính xác
Lời giải của GV VietJack
Đáp án C
Thông tin trong đoạn cuối “…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…”
→ sự hình thành băng ở biển KHÔNG làm giảm độ mặn của nước biển.
Câu 8:
What can be inferred about the water near the bottom of oceans?
What can be inferred about the water near the bottom of oceans?
Đáp án chính xác
Lời giải của GV VietJack
Đáp án B
Đoạn cuối của bài “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”
→ có thể suy ra rằng độ mặn của nước gần dưới đáy biển tương đối cao.
Nhà sách VIETJACK:
CÂU HỎI HOT CÙNG CHỦ ĐỀ
Câu 3:
Which of the following would be the best title for the passage?
Which of the following would be the best title for the passage?
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