PPT Plankton PowerPoint Presentation, free download ID473549
PPT Plankton PowerPoint Presentation, free download ID473549 . What causes deep water circulation? Upwelling occurs where surface currents are diverging, or moving away from each other. PPT Plankton PowerPoint Presentation, free download ID473549 from www.slideserve.com The upwelling is of two types, one is offshore upwelling and the second is the deep sea upwelling. Upwelling is caused when strong wind blows along the coast. The upwelling is caused by wind action, cooling of the surface water and the density.