Question

Q. Which of the following statements are correct regarding Thermocline?

Select the correct answer using the code given below:

• A. 1 and 2 only
• B. 2 only
• C. 1 and 3 only
• D. 1, 2 and 3

Answer 1

The correct option is B 2 only

Explanation:

• Statement 1 is incorrect: In the thermocline, the temperature decreases rapidly from the mixed layer temperature to the much colder deep water temperature.
• Statement 2 is correct: It is an oceanic water layer in which water temperature rapidly decreases with increasing depth. About 90 per cent of the total volume of water is found below the thermocline.
• Statement 3 is incorrect: In the ocean, the depth and strength of the thermocline vary from season to season and year to year. It is semi-permanent in the tropics, variable in temperate regions (often deepest during the summer), and shallow to non-existent in the polar regions, where the water column is cold from the surface to the bottom.