About circulating Water in the oceans

Ocean circulation is driven by persistent winds at the surface
and density differences lower down. The pattern of wind-surface
currents is dominated by five great loops or ‘gyres’: two in the
Atlantic, two in the Pacific, and a fifth in the Indian Ocean.
Pulled by the prevailing winds, they are curled into loops firstly
by running up against land barriers and secondly by the effect
of the Earth’s rotation.

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