Which water mass is characterized by increasing density with deeper depths?
a. Surface zone
b. Deep zone
c. Pycnocline zone
d. Mixed layer
ANS: C
The pycnocline zone has a direct relationship between density and depth. This means as the depth
increases in the water column, the density also increases. This is mainly the effect of rapidly
decreasing water temperatures. Information can be found in the section The Ocean Is Stratified by
Density.
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