What is the general term for the mass horizontal movement of seawater?

• A. Current
• B. Convergence Zone
• C. Upwelling
• D. Eddy

Answer: (A)

The mass horizontal movement of seawater is called a current. Currents represent the bulk flow of water moving horizontally, stretching across vast areas and at different depths. They are driven mainly by winds at the surface and by density differences that create deep, thermohaline flows, with the Coriolis effect organizing them into gyres and patterns around continents. Upwelling, by contrast, is vertical movement where deeper water rises to the surface. An eddy is a smaller, circular swirl within a current, a localized feature rather than the general horizontal transport. A convergence zone is a region where opposing currents meet and pile up water, which is a state within currents rather than the broad term for horizontal movement.