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Originally Posted by Twelvefield
As far as I know, the only thing that pushes the water around into anything like currents is the wind. More precisely, the wind will affect sailing on the surface, and could act like a current, but I don't think that currents underwater are modelled.
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Actually the warmth of the water creates currents as well. For example, the gulf stream. The oceans are a 3D environment that moves in all directions. You can do an experiment to see how 'currents' work. Take a large pot, fill it full of water, add some salt, place it on the stove top and then turn on medium heat. As the water heats up, you can actually see 'currents'. Of course, get your parents permission first.
