You searched for: “upwelling
upwelling
Something that occurs when surface waters sink to the bottom, slowly migrate across the deep oceanic basins, and rise to the surface.

These waters contain nutrients from the sunken carcasses of small organisms. This surfacing thus brings nutrients to the surface, nourishing plankton, and is an important aspect of the marine food web.

This entry is located in the following unit: Ocean and Deep Sea Terms (page 6)