by Robet Krulwich | Krulwich Wonders
Most of the surface currents in the ocean are shaped by wind. In this visualization from the folks at NASA, the ocean is rich with lazy spirals that move in great circular sweeps (called “gyres”) clockwise in the northern hemisphere, counterclockwise in the south. Think of the ocean surface here as a reflection of the winds above, a kind of watery mirror (though the spinning of the Earth, tugs of sun and moon and obstruction of continents play a part.) Click on this video, and you’ll see the dance of wind-on-water everywhere.
Google Earth view: