Another large system of ocean currents that affect weather and climate is known as what?

• A. Gulf Stream
• B. El Niño
• C. Great Ocean Conveyor Belt
• D. Pacific Gyre

Answer: (C)

The big idea here is the global thermohaline circulation, often called the Great Ocean Conveyor Belt. This is the continuous loop of surface and deep currents worldwide that is driven by differences in water density caused by temperature and salinity. Warm, lighter water moves toward higher latitudes near the surface, where it cools, becomes denser, sinks, and travels as deep currents to other regions, eventually rising again and completing the loop. This massive system links all the oceans and moves heat around the planet, helping to regulate climate and weather patterns.

Why this best fits: it describes a global, long-lasting circulation that influences climate on a broad scale by redistributing heat and affecting nutrient and carbon exchange. The other options are important current patterns or events, but they are narrower in scope: the Gulf Stream is a major surface current within part of the system; El Niño is a tropical Pacific climate pattern that shifts surface temperatures and weather but is not a planet‑scale circulation; a Pacific Gyre is a large surface current system specific to the Pacific. The Great Ocean Conveyor Belt captures the idea of the global, density-driven circulation that underpins long-term climate behavior.