Which of the following regions contains the least Gammas?

The region containing the least Gammas is the Equator. At the Equator, the distribution of seawater temperature, salinity, and density typically results in lower Gamma levels compared to other regions. The Gamma value, which is related to the sound speed in water, is often influenced by the temperature and salinity profile of the ocean.

In contrast, areas like the Poles tend to have colder water temperatures, while regions like the Arabian Sea and Indian Ocean can have varying salinity and temperature distributions that lead to higher Gamma values. Thus, the combination of tropical conditions at the Equator, which tends to stabilize sound speed and reduce Gamma levels, makes it the region with the least amount of Gammas.