Upwelling
Ocean upwelling is an important process that recycles nutrients and energy in the ocean. As wind (green arrows) pushes offshore, it causes water from the ocean bottom (red arrows) to move to the surface, bringing up nutrients from the ocean depths.
Source
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"OpenStax College, Biogeography. October 17, 2013."
http://cnx.org/content/m44857/latest/Figure_44_02_04.png
OpenStax CNX
CC BY 3.0.
