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National Oceanographic Data Center, Exploring Earth

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Find a Flash animation picturing monthly variations in phytoplankton, the plants that make up the base of the ocean's food chain. Higher concentrations of phytoplankton are rendered in orange and red, lower concentrations in purple and blue. Note the high productivity near the poles and where upwelling zones exist. The animation can be paused and replayed to stress important points.

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This resource is referenced here:Keywords: el nino, la nina, el niño, la niña, plant productivity