The lsquo mean sea level rsquo of all the oceans is same This is so because........

Geography World - Water Bodies

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The ‘mean sea level’ of all the oceans is same. This is so because

The gravitational pull exerted by the sun and moon is constant on all oceans.

The oceanic relief of all oceans is similar

All the oceans of world are connected thereby ensuring same water level across all oceans.

All of the above are correct in this context.

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Explanation:

As all the oceans of world are connected, the ocean is one continuous body of water, and its surface tends to seek the same level throughout the world. However, winds, currents, river discharges, and variations in gravity and temperature prevent the sea surface from being truly level.
The mean sea level is calculated through an average taken over a long period of time.