The uppermost 10 percent of the oceans contain more heat than the entire atmosphere. The temperature of the oceans is not uniform.
The surface temperature of the oceans declines from the equator towards the poles as the Sun's rays are vertical on the equator and become slanting as one move towards the poles.
The Northern Hemisphere has more land area than that of the Southern Hemisphere. Therefore, the oceans of the Northern are warmer than that of the Southern Oceans.
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