When ocean currents and winds combine, nutrients rise up from the depths in a process called upwelling. The plankton follow the nutrients, and predators follow the plankton. This results in a feeding frenzy at all links of the food chain. Most of the seafood we eat is caught at these upwelling sites.
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Key Facts In This Video
Most plankton can't fight the ocean's currents, and drift along with them. 00:39
Some types of plankton remain small drifters, whereas others grow into different forms of marine life, including crustaceans. 01:34
When wind and currents carry nutrients up toward the ocean surface, plankton follow, drawing hordes of larger predators. 01:55