Q1 (NDA-I/2016) Geography › World Physical Geography › Ocean water properties Answer Verified

Statement I: There is high salinity in Red Sea. Statement II: Rate of evaporation is high in Red Sea.

Both the Statements are individually true and Statement II is the correct explanation of Statement I.

Both the Statements are individually true but Statement II is not the correct explanation of Statement I.

Statement I is true but Statement II is false.

Statement I is false but Statement II is true.

Result

Your answer: — · Correct: A

Explanation

The Red Sea is characterized by exceptionally high salinity, often reaching levels as high as 41 parts per thousand [1]. This high salinity is primarily driven by the region's hot and arid climate, which results in extreme rates of evaporation [1]. In such environments, the loss of water through evaporation significantly exceeds the input of fresh water, thereby concentrating the remaining salts . Furthermore, the Red Sea receives a negligible amount of fresh water because no major rivers or rivulets drain into it, and precipitation is minimal . Its semi-enclosed nature and restricted water exchange with the open ocean through the narrow Bab el-Mandeb strait further prevent the dilution of its saline waters [2]. Consequently, the high rate of evaporation is the direct cause of the high salinity levels observed, making Statement II the correct explanation for Statement I.

Sources

[1] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 33: Ocean temperature and salinity > High Salinity Regions > p. 519
[2] Certificate Physical and Human Geography , GC Leong (Oxford University press 3rd ed.) > Chapter 12: The Oceans > Salinity of the Ocean > p. 108

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Statement I: There is high salinity in Red Sea. Statement II: Rate of evaporation is high in Red Sea.

Explanation

SIMILAR QUESTIONS

Statement I : While putting clothes for drying up, we spread them out. Statement I : The rate of evaporation increases with an increase in surface area.

Assertion (A) : Despite low evaporation and stable stratification of the atmosphere, salinity is high in polar regions. Reason (R) : Sea water freezes leaving the remaining water saline than before.

Assertion (A): The salinity of oceans is relatively higher near the equator than at other regions. Reason (R): Equator region has heavy rainfall, high relative humidity and calm air.

Consider the following statements : 1. The Red Sea receives very little precipitation in any form. 2. No water enters the Red Sea from rivers. Which of the statements given above is/are correct ?

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