geomagnetic polarity reversal meaning in English

地磁极性倒转

This paper introduces the formation of magnetic field , polarity reversal , secular variation and the use of geomagnetic polarity reversal or susceptibility in stratigraphic study
摘要本文介绍了地球磁场的成因、极性变化以及运用极性倒转划分对比地层和指示环境。
But we do have convincing information obtained from magnetized mineral grains in rocks that tells us that geomagnetic polarity reversals have occurred a great many times in the history of the earth
但是我们确实从岩石破磁化的矿物颗粒中获得了令人信服的信息，这个信息告诉我们在地球史上曾发生了很多次地磁极性倒转。