mid-ocean ridges - 2024 PLAYTIME

Question

These regions are the primary source of tholeiitic basalt. For 10 points each:

[10m] Name these regions whose basalt deposits, known by a four-letter acronym, provide evidence for the Vine–Matthews–Morley hypothesis, which attempts to explain banded patterns that appear around these regions.

ANSWER: mid-ocean ridges [accept MORBs; prompt on seafloors or divergent plate boundaries]

[10e] According to the Vine–Matthews–Morley hypothesis, MORBs exhibit striping corresponding to reversals of this entity. The dynamo theory explains the existence of this entity, which is generated by nickel and iron convection in the outer core.

ANSWER: Earth’s magnetic field [or Earth’s B-field]

[10h] Tholeiitic basalt can be found at the beginning of the tholeiitic magma series, which ends with the tholeiitic variety of this rock. This rock has the most silica content in the series in contrast with andesite and dacite.

ANSWER: tholeiitic rhyolite

<CT, Other Science - Earth Science>

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Summary


2025 PLAYTIME @ CWRU	12/10/2024	Y	5	10.00	100%	0%	0%
2025 PLAYTIME @ Claremont	12/10/2024	Y	5	14.00	80%	40%	20%
2025 PLAYTIME @ Florida	12/10/2024	Y	3	13.33	100%	0%	33%
2024 PLAYTIME @ Harvard	04/26/2025	Y	4	7.50	75%	0%	0%
2024 PLAYTIME @ JHU	10/26/2024	Y	7	11.43	71%	14%	29%
2025 PLAYTIME @ Northwest	12/10/2024	Y	4	10.00	75%	25%	0%
2025 PLAYTIME Online	04/26/2025	Y	9	16.67	100%	56%	11%
2025 PLAYTIME @ Sheffield	12/10/2024	Y	7	12.86	86%	29%	14%
2024 PLAYTIME @ UBC	10/05/2024	Y	8	11.25	75%	25%	13%
2024 PLAYTIME @ Virginia Tech	07/11/2025	Y	3	16.67	100%	67%	0%
2024 PLAYTIME @ WashU	10/12/2024	Y	5	16.00	100%	60%	0%

Data


Michigan A	Ohio State B	0	10	0	10
Michigan B	Ohio State C	0	10	0	10
Ohio State A	Michigan D	0	10	0	10
Michigan C	Oberlin	0	10	0	10
Art of Premature Signaling	girl 15 whale i mean they	10	10	0	20
Claremont B	Jason B	10	10	0	20
Caltech	UCLA A	0	10	10	20
UCSB	UCLA B	0	0	0	0
Qin Shi Huang's Immortality Poison	Billy's Bastion	0	10	0	10
Edwin Laundrorat's Long-Lost Man Unclothès Rat Degrosses	Too much from you lately	0	10	10	20
Project2025BC: Make Assyria Great Again	Keeping Up With the Cardassians	0	10	0	10
Claremont A	UCSD	0	10	0	10
Brandeis	Lexington	0	0	0	0
Harvard	Brown	0	10	0	10
MIT	Belmont	0	10	0	10
RIT	Boston University	0	10	0	10
Maryland A	George Mason B	0	10	10	20
CWRU	George Mason C	0	0	0	0
Georgetown	NYU B	0	10	0	10
Johns Hopkins A	NYU C	0	10	0	10
Johns Hopkins B	Haverford B	0	0	0	0
Maryland B	Haverford A	0	10	10	20
Rutgers	NYU A	10	10	0	20
Ohio State D	Pittsburgh	0	10	0	10
Arizona State University A	Alberta	10	10	0	20
Carleton	Arizona State University B	0	0	0	0
UW B	South Dakota School of Mines	0	10	0	10
Washington Connections	UW A	0	10	0	10
Quatumvirate	2 Italians, 2 Poles, All Noles	0	10	0	10
Egypt Airlines Haters	Four Generalists in Search of a Power	10	10	0	20
Notre Dame + Epic Games	Free Agents 1	10	10	0	20
Auburn 2026	Goober Gang	0	10	0	10
MSJ	Illinois Orange	0	10	0	10
mongeese	Mahjonng Masters	10	10	10	30
Mike Dukakis Tank Battalion	evil women enjoyers	10	10	0	20
Monsieur Hulot's Academic Team	Gruh	10	10	0	20
Trip-Hop Quizzer Tricky	we need new names	0	10	0	10
Warwick A	Sheffield B	0	10	0	10
Birmingham	Sheffield C	0	10	0	10
Cambridge	Imperial A	10	10	0	20
Imperial B	Edinburgh	0	10	0	10
LSE	Lancaster	10	10	0	20
Manchester	Sheffield A	0	10	10	20
Warwick C	Warwick B	0	0	0	0
UBC	Mac A	0	0	0	0
McGill A	Toronto C	0	10	0	10
Ottawa A	McGill B	0	10	0	10
Waterloo A	Simon Fraser	10	10	10	30
Toronto B	Toronto A	10	10	0	20
Guelph	Toronto D	0	0	0	0
Waterloo B	Toronto Metropolitan	0	10	0	10
Toronto E	Waterloo C	0	10	0	10
Master and Margaritaville	4 quizbowl pros go Virginia on North Carolina	10	10	0	20
Somehow Paula Deen Returned	Adrianne Lenker 4 Nobel Lit Prize 2K65	0	10	0	10
Even in Blacksburg There I Am	Ashurbanipal’s Drag Race	10	10	0	20
Truman State	Illinois A	10	10	0	20
Iowa State	Illinois B	10	10	0	20
WashU Bulbasaur	SIUE	0	10	0	10
WashU Bulbasaur	SIUE	0	10	0	10
WashU Bulbasaur	Chicago B	10	10	0	20
WashU Bulbasaur	Chicago B	10	10	0	20
WashU Bulbasaur	SIUE	0	10	0	10
WashU Bulbasaur	SIUE	0	10	0	10
WashU Bulbasaur	Chicago B	10	10	0	20
WashU Bulbasaur	Chicago B	10	10	0	20
Chicago A	WashU Squirtle	0	10	0	10