Which term best describes the horizontal movement of surface water driven by wind?

Which term best describes the horizontal movement of surface water driven by wind?

• A. Surface Current
• B. Langmuir Circulation
• C. Transverse Current
• D. Undercurrent

Answer: (A)

Surface currents describe the horizontal movement of water in the upper layer caused by wind stress. When wind blows across the sea, roughness at the surface drags the topmost water layer along, creating a current. The Earth’s rotation (Coriolis effect) then deflects this flow, so the surface current often runs at an angle to the wind and, on large scales, forms gyres with characteristic rotation in each hemisphere. Langmuir Circulation involves vertical cells produced by wind and waves and shows surface convergence lines, not the broad, sustained horizontal flow described by surface currents. An undercurrent is water moving below the surface, and “transverse current” isn’t the standard term for wind-driven surface motion. So, the term that best fits is surface current.

Surface currents describe the horizontal movement of water in the upper layer caused by wind stress. When wind blows across the sea, roughness at the surface drags the topmost water layer along, creating a current. The Earth’s rotation (Coriolis effect) then deflects this flow, so the surface current often runs at an angle to the wind and, on large scales, forms gyres with characteristic rotation in each hemisphere. Langmuir Circulation involves vertical cells produced by wind and waves and shows surface convergence lines, not the broad, sustained horizontal flow described by surface currents. An undercurrent is water moving below the surface, and “transverse current” isn’t the standard term for wind-driven surface motion. So, the term that best fits is surface current.