The concentration of this anion appears in the definition of a saturation state typically denoted capital omega. For 10 points each:
[10m] Name this anion, the most negatively charged anion whose concentration is displayed on a Bjerrum plot. The lower boundary of the lysocline is this anion’s namesake compensation depth.
ANSWER: carbonate [or CO3 2-minus; accept calcium carbonate or CaCO3; accept carbonate compensation depth; prompt on CCD; reject “bicarbonate”]
[10e] This process has reduced the carbonate compensation depth, making it more difficult for marine calcifying organisms to build shells. This process is caused by absorption of carbon dioxide into seawater.
ANSWER: ocean acidification [or OA; prompt on acidification]
[10h] These Rhizarian protists have been negatively impacted by ocean acidification. The remains of coccolithophores and these organisms are primary contributors to calcareous ooze.
ANSWER: foraminifera [or forams]
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