carbonate - 2025 ACF Winter

Question

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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Summary


Florida	Main	Y	13	9.23	85%	0%	8%
North	Main	Y	10	11.00	100%	0%	10%
Overflow	Main	Y	3	13.33	100%	33%	0%
Pacific Northwest	Main	Y	10	11.00	80%	30%	0%
Southeast	Main	Y	11	9.09	82%	9%	0%
Upper Mid-Atlantic	Main	Y	8	10.00	75%	13%	13%
Upstate NY	Main	Y	8	7.50	63%	13%	0%
2025 ACF Nationals	2025-08-09	Y	14	9.29	86%	7%	0%

Data


McMaster C	Queen's A	0	10	0	10
Guelph A	McGill A	0	10	0	10
Toronto B	Toronto A	0	10	10	20
Toronto C	McMaster A	0	10	0	10
Toronto D	Ottawa	0	10	0	10
Toronto E	Western Ontario	0	10	0	10
Toronto F	Toronto G	0	0	0	0
Toronto H	Carleton	0	10	0	10
McGill C	Toronto I	0	10	0	10
Toronto J	Toronto Metropolitan	0	10	0	10
Toronto K	McGill B	0	10	0	10
Guelph B	Waterloo	0	0	0	0
Queen's B	McMaster B	0	10	0	10
George Mason A	Penn A	0	10	10	20
Maryland C	George Washington B	0	10	0	10
Maryland D	Johns Hopkins B	0	10	0	10
Johns Hopkins A	Maryland A	0	10	0	10
Maryland B	Georgetown B	0	10	0	10
NYU B	Notre Dame E	0	10	0	10
Penn B	Georgetown A	0	10	0	10
UMBC A	Johns Hopkins C	0	10	0	10
VCU A	George Mason B	0	10	0	10
George Washington A	Catholic University	0	10	0	10
Missouri A	SIUE	10	10	0	20
Truman State	WashU B	0	10	0	10
WashU D	William Woods	0	10	0	10
Notre Dame D	Chicago A	0	10	0	10
Chicago D	Notre Dame A	0	10	0	10
Illinois C	Louisville A	0	10	0	10
UIC	Indiana A	0	10	0	10
Michigan B	Indiana B	0	10	0	10
Kentucky	Michigan D	0	0	0	0
Chicago B	Michigan C	10	10	0	20
Michigan A	Purdue B	10	10	0	20
Purdue C	Notre Dame B	0	10	0	10
Illinois A	Louisville B	10	0	0	10
BU	MIT B	10	0	0	10
BC B	Bowdoin B	0	0	0	0
Brown C	Brandeis Clemenceau	0	10	0	10
Brown B	Brandeis Lloyd George	0	10	0	10
Brandeis Wilson	Brandeis Orlando	0	10	0	10
Cornell-UG	Dartmouth	0	10	0	10
Harvard	Brown A	0	10	0	10
MIT A	Amherst A	0	10	0	10
Tufts A	Tufts B	0	10	0	10
Yale A	Williams	0	10	0	10
Yale B	BC A	0	10	0	10
Alberta B	Northwestern A	0	0	0	0
Ohio	Arizona State B	0	0	0	0
Northwestern C	Rose State	0	10	0	10
Texas A	Arizona State A	0	10	0	10
McGill D	Texas B	10	10	0	20
Tulsa	UTD B	0	10	0	10
Northwestern B	UCO	0	10	0	10
Iowa	UTD A	0	10	10	20
Alabama A	Alabama B	0	10	0	10
Huntsville A	Auburn B	0	10	0	10
Auburn A	Bruin A	10	10	0	20
Georgia Tech C	Georgia Tech A	0	10	0	10
Georgia Tech B	Vanderbilt B	0	10	0	10
Vanderbilt A	Georgia Tech D	0	0	0	0
Huntsville B	Sewanee A	0	0	0	0
Mississippi State A	UAB A	0	0	0	0
Imperial B	Bristol B	0	10	0	10
City St George's A	Sheffield B	0	10	0	10
Imperial C	Durham B	0	10	0	10
Cambridge A	Edinburgh B	0	10	0	10
LSE A	Edinburgh A	0	10	0	10
Cambridge C	Lancaster A	0	10	0	10
Durham A	Oxford B	0	10	0	10
Sheffield C	Southampton A	0	0	0	0
Bristol A	Warwick B	0	10	0	10
LSE B	Manchester B	0	0	0	0
Manchester A	Oxford A	0	10	0	10
Cambridge D	Southampton B	0	10	0	10
Warwick A	Sheffield A	0	10	0	10
Imperial A	Birmingham A	10	10	0	20