This is an area of the ocean where bottom layers of water, which are colder and richer in nutrients, are forced up to the surface. This is an area of high productivity. a. upwelling b. aphotic zone c.

This is an area of the ocean where bottom layers of water, which are colder and richer in nutrients, are forced up to the surface. This is an area of high productivity.

a. upwelling
b. aphotic zone
c. pelagic zone

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