What serves as a natural "tape recording" of the history of the Earth's magnetic field reversals?

ocean floor
antarctic ice cap
coal deposits
Himalayas
In 1950s sci­en­tists dis­cov­ered ze­bra-­like pattern of the ocean floor magnetic po­lar­i­ty. It turned out that stripes of rock parallel to the mid-o­cean ridge crest al­ter­nate in magnetic polarity (nor­mal-re­versed-nor­mal, etc.), sug­gest­ing that they were formed during dif­fer­ent epochs doc­u­ment­ing the normal and reversal episodes of the Earth's magnetic field.

Answers distribution

ocean floor
antarctic ice cap
coal deposits
Himalayas
answers
flagthe United Arab Emirates
81%
7%
3%
3%
27
flagItaly
78%
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flagSweden
74%
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flagBelgium
66%
29%
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flagthe United Kingdom
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flagthe Netherlands
63%
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11%
11%
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flagGreece
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flagCanada
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flagGermany
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flagDenmark
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flagFrance
58%
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9%
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flagPoland
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flagAustria
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flagthe United States
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flagSpain
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flagIndia
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flagUnknown
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flagAustralia
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flagNorway
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Gender

men46%
women56%
ocean floor
46%
56%
antarctic ice cap
30%
19%
coal deposits
15%
15%
Himalayas
7%
8%

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What serves as a natural "tape recording" of the history of the Earth's magnetic field reversals?
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Illustration: NASA Goddard
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