The pycnocline isolates the majority of the world ocean from:a
heating and cooling brought on by solar energy fluctuations.
b. wind driven circulations.
c. light.
d. All of these choices conditions
ANS: D
The pycnocline layer protects deep water from surface circulation. There can be multiple density
layers in the deep zone, but these are not affected by the surface conditions. Information can be found
in the section The Ocean Is Stratified by Density
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