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
flagItaly
83%
5%
3%
6%
130
flagAustria
72%
18%
6%
2%
50
flagLithuania
72%
18%
3%
6%
33
flagSweden
69%
14%
6%
7%
63
flagthe Netherlands
65%
11%
12%
9%
101
flagBelgium
65%
31%
0%
3%
29
flagthe United Kingdom
63%
19%
10%
4%
692
flagCanada
62%
13%
16%
7%
66
flagFrance
62%
25%
9%
1%
62
flagGreece
61%
12%
17%
5%
39
flagGermany
60%
19%
11%
8%
269
flagDenmark
58%
34%
4%
4%
50
flagPoland
57%
21%
13%
6%
18317
flagIndia
55%
23%
7%
10%
88
flagthe United States
53%
26%
11%
6%
703
flagSpain
50%
34%
9%
6%
32
flagRepublic of Ireland
43%
26%
14%
14%
57
flagUnknown
41%
33%
14%
9%
862
flagAustralia
38%
40%
9%
9%
42
flagNorway
37%
37%
20%
2%
43

Gender

men46%
women57%
ocean floor
46%
57%
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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Author: globalquiz.org
Illustration: NASA Goddard
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