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Question

Which among the following statements is/are true about the role of oceans in the global water cycle?

A
Oceans are the main thermal regulating element of the climate system.
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B
Nearly 86% of global evaporation comes from the oceans.
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C
The water cycle has a significant impact on ocean salinity, and thus density, circulation, stratification, and mixing.
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D
Alterations to the global water cycle cannot be studied due to technological and logistical constraints.
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Solution

The correct option is C The water cycle has a significant impact on ocean salinity, and thus density, circulation, stratification, and mixing.
The ocean plays a key role in the global water cycle. Majority of evaporation (E) and precipitation (P) occurs in the oceans as they hold 97% of water. E-P determines surface salinity of the ocean. Salinity and temperature determine the density of ocean water, and density influences the circulation. Ocean salinity measurements can provide insights into water-cycle operation and its long-term change. Environmentalists have developed climate models that provide insights on alterations to the global water cycle.

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