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单选题
According to the passage, which of the following is true of the ratios of oxygen isotopes in ocean sediments?
A
They indicate that sediments found during an ice age contain more calcium carbonate than sediments formed at other times.
B
They are less reliable than the evidence from rocks on land in determining the volume of land ice.
C
They can be used to deduce the relative volume of land ice that was present when the sediment was laid down.
D
They are more unpredictable during an ice age than in other climatic conditions.
E
They can be used to determine atmospheric conditions at various times in the past.
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参考解析
解析：
细节题。第二段第二句指出：relative land-ice volume for a given period can be deduced from the ratio of two oxygen isotopes, 16 and 18, found in ocean sediments，故可知洋底的氧同位素比例可以用来推算形成时陆冰的体积，故本题应选C项。
细节题。第二段第二句指出：relative land-ice volume for a given period can be deduced from the ratio of two oxygen isotopes, 16 and 18, found in ocean sediments，故可知洋底的氧同位素比例可以用来推算形成时陆冰的体积，故本题应选C项。
更多 “单选题According to the passage, which of the following is true of the ratios of oxygen isotopes in ocean sediments?A They indicate that sediments found during an ice age contain more calcium carbonate than sediments formed at other times.B They are less reliable than the evidence from rocks on land in determining the volume of land ice.C They can be used to deduce the relative volume of land ice that was present when the sediment was laid down.D They are more unpredictable during an ice age than in other climatic conditions.E They can be used to determine atmospheric conditions at various times in the past.” 相关考题
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According to the passage, which is true about the ocean?A. The waters of the ocean came from rain water.B. The ocean was formed from the, lighter rock materials.C. The vast single ocean formed about 200 million years ago.D. The ocean covered the whole surface of the earth at very beginning.
考题
请阅读短文，完成此题。
When we analyze the salt salinity(盐溶度 ) of ocean waters, we find that it varies 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. In this manner, the salinity is increased, since the salt stays behind. If this is carried to the extreme, of course, white 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.
Normally, in hot 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, 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 portion of the oceans of the world.
Which of the following statements is TRUE according to the passage?
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A．Oceanic salinity has great effect on sea life.
B．Many factors combine to cause changes in oceanic salinity.
C．The movement of the water is related to the amount of salt.
D．The temperature of the water has much to do with the oceanic salinity.
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