The main factor in causing mid ocean currents and circulation is wind-drag that moves water along allowing other water to flow in and replace it from the sides or to upwell from depth.

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Mid-ocean currents and circulation are primarily driven by wind-drag, which moves water along and allows for other water to flow in and replace it from the sides, or to upwell from depth. This type of circulation is known as the thermohaline circulation and is essential for maintaining global ocean temperatures and regulating climate.

The Main Factor in Causing Mid Ocean Currents and Circulation