Question

which of the following has a major role regulating global temperatures?
oceanic chemistry
ocean layering
oceanic currents
oceanic salinity

Explanation:

Oceanic currents play a major role in regulating global temperatures. They transport heat from the equator to the poles. For example, the Gulf Stream carries warm water from the tropics to the North Atlantic, influencing the climate of Europe. Oceanic chemistry mainly deals with chemical composition of seawater, ocean layering is about density - based water layers, and oceanic salinity is about salt content. These are less directly involved in large - scale temperature regulation compared to currents.

Answer:

oceanic currents