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
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29
flagBelgium
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Gender

men45%
women51%
ocean floor
45%
51%
antarctic ice cap
30%
20%
coal deposits
18%
18%
Himalayas
5%
9%

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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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