What term describes a gyre or current in balance between the Coriolis effect and gravity, literally meaning 'turned by Earth'?

What term describes a gyre or current in balance between the Coriolis effect and gravity, literally meaning 'turned by Earth'?

• A. Gulf Stream
• B. ENSO
• C. Geostrophic Gyre
• D. El Nino

Answer: (C)

Geostrophic balance is the idea that horizontal flow settles where the pressure gradient force from gravity is exactly balanced by the Coriolis force from Earth's rotation. When this balance holds, water tends to move parallel to lines of equal pressure (isobars), producing circular, gyre-like patterns on a large scale. The term that describes a gyre or current in this balanced state and literally means “turned by Earth” is geostrophic gyre. The Gulf Stream is an example of a real current, not the balance itself, while ENSO and El Niño refer to climate patterns rather than this specific force balance.

Geostrophic balance is the idea that horizontal flow settles where the pressure gradient force from gravity is exactly balanced by the Coriolis force from Earth's rotation. When this balance holds, water tends to move parallel to lines of equal pressure (isobars), producing circular, gyre-like patterns on a large scale. The term that describes a gyre or current in this balanced state and literally means “turned by Earth” is geostrophic gyre. The Gulf Stream is an example of a real current, not the balance itself, while ENSO and El Niño refer to climate patterns rather than this specific force balance.