Which mechanism causes deep-water oxygen depletion in poorly mixed fjords with high organic matter input?

💡 Explanation

When fjords receive high organic matter, microbial decomposition consumes dissolved oxygen as a result of cellular respiration, especially in deep waters with limited mixing. Therefore oxygen depletion results, rather than upwelling, stratification, or photo-oxidation which require different hydrographic conditions and chemical compounds.

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• Which process controls stalactite mineral stratification by deposition?