Explain the processes than maintain the basin-wide oceanic gyres.

As explained below.

Explanation:

An ocean gyre is a large system of circulation of oceanic currents, by the global winds and global forces created by the rotation of the planet on its axis. These gyres help in driving the conveyor belt that circulates the oceanic water throughout the planet. Various types of Oceanic Gyres are found on the globe like tropical, subtropical, and subpolar gyres. The tropical gyres are less developed ad tend to be found in the east to west, north to a south extent. Formed by pacific equatorial currents system. the subtropical gyre is a system of the high-pressure zone that moves in a clockwise direction from the northern hemisphere, and anticlockwise in the southern hemisphere. The subpolar gyres found at a height of 60 degrees, consists of clockwise circulation of winds in low-pressure areas around the northern hemisphere. Like the Aleutian and Icelandic low. The recent development of climate change and the unequal distribution of heat floes have accelerated the process of the formation of gyres.

Physical systems is the answer