magnetic polarity reversal

基本解释

The magnetic polarity reversal record is often illustrated by means of a column with black and white intervals depicting the two polarity.
地磁极性反转记录通常用代表两种极性的黑白间隔所组成的极性柱来表示。
The magnetic polarity reversal polarity reversal record is often illustrated by means of a column with black and white intervals depicting the two polarity.
地磁板性反转纪录通常用代表两种极性的黑白间隔所组成的极性柱来表示。
geology.nju.edu.cn
They claim a relationship between the rotation and the magnetic polarity of Earth, which does change irregularly, with a magnetic reversal taking place every 400,000 years on average.
他们声称地球磁极和自转有关系。地球的磁极的确会不规律的改变，大约平均400，000年发生一次磁极转换。