What is the source of high carbon dioxide levels at middle depths in the ocean?

a. The decay of the remains of organisms
b. It diffuses from the atmosphere
c. Chemical reactions
d. Plant respiration


ANS: A
Carbon dioxide levels in the middle depths of the ocean are higher than they are at the surface.
Respiration from animals and the decay of the remains of organisms are the large contributors to these
high levels of carbon dioxide. Information can be found in the section The Ocean's Acid-Base Balance
Varies with Dissolved Components and Depth.

Environmental & Atmospheric Sciences

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