Upwelling:
The transport of water to deeper levels.
Upwelling occurs when surface waters diverge. Upwelling brings water to the surface. Many ocean animals live where upwelling occurs because it also brings nutrients to the surface.
Downwelling:
A downward current of surface water in the ocean
Downwelling is basically a convergent boundary in the ocean. It occurs when surface waters converge. Downwelling allows animals to live in the deep ocean because it brings oxygen down.
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