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单词 polarity epoch
释义

Definition of polarity epoch in English:

polarity epoch

noun
Geology

  • A long period of time (typically of the order of 100,000 to 10,000,000 years) over which the earth's magnetic field is predominantly of one polarity.

Origin

1960s; earliest use found in Nature: a weekly journal of science.

Definition of polarity epoch in US English:

polarity epoch

noun
Geology

  • A long period of time (typically of the order of 100,000 to 10,000,000 years) over which the earth's magnetic field is predominantly of one polarity.

Origin

1960s; earliest use found in Nature: a weekly journal of science.
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更新时间：2025/1/30 22:02:08