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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.

Dust storms hit Interstate 86 resulting in numerous crashes, temporary closure of freeway . One major cause of that dust bowl was severe droughts during the 1930’s. The other cause was capitalism. Dustpocalypse Huge dust swirl storms Iraq and Iran from www.zmescience.com Economic depression coupled with extended drought, unusually high temperatures, poor agricultural. 3 years of hot weather droughts and excessive farming were the main causes of the great dust bowl. The dust bowl hit the united states in the early 1930's.