Which term describes a circular movement of water usually formed where currents pass obstructions or between two adjacent currents?

Which term describes a circular movement of water usually formed where currents pass obstructions or between two adjacent currents?

• A. Current
• B. Upwelling
• C. Eddy
• D. Downwelling

Answer: (C)

The concept being tested is how circular water motion forms when moving water meets an obstacle or interacts with another current. When a flow encounters something that blocks it or when two currents meet and shear, the water is redirected and begins to rotate, creating a circular patch of moving water. This rotating body is called an eddy. Eddies can be different sizes and may spin clockwise or counterclockwise, and they play a role in transporting heat, nutrients, and organisms. This differs from a general current, which is mainly a steady horizontal flow; upwelling, which is the upward movement of deeper water to the surface; and downwelling, which is the sinking of surface water. The hallmark feature here is the circular, swirling motion that characterizes an eddy.

The concept being tested is how circular water motion forms when moving water meets an obstacle or interacts with another current. When a flow encounters something that blocks it or when two currents meet and shear, the water is redirected and begins to rotate, creating a circular patch of moving water. This rotating body is called an eddy. Eddies can be different sizes and may spin clockwise or counterclockwise, and they play a role in transporting heat, nutrients, and organisms.

This differs from a general current, which is mainly a steady horizontal flow; upwelling, which is the upward movement of deeper water to the surface; and downwelling, which is the sinking of surface water. The hallmark feature here is the circular, swirling motion that characterizes an eddy.