When world hydrography day is celebrated?

Q.  When world hydrography day is celebrated?
- Published on 16 Sep 15

a. 14 April
b. 21 June
c. 4 March
d. 20 November

ANSWER: 21 June
 
World Hydrography Day, 21 June, was adopted by the International Hydrographic Organization as an annual celebration to publicize the work of hydrographers and the importance of hydrography.

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