地球上最后一次地磁倒转大约是78万年前。
The last geomagnetic reversal for Earth was about 780,000 years ago.
一些科学家的理论认为，即使不是所有的毁灭地球上数以千计生物物种的大规模的灭绝与地磁倒转有关，也会有一些事件可能与地磁倒转有关。
Some scientists theorize that some, if not all of the mass extinctions that have wiped out thousands of species of life on Earth might be correlated with magnetic reversals.
尽管在过去地质时期地磁场发生了多次倒转，但要预测下次倒转将在何时发生也还是不可能的。
Although magnetic reversals have occurred many times in the geologic past, it is not yet possible to predict when the next reversal will occur.
地磁场倒转和长期变的理论、观测和应用以及磁性地层学；
Theory, observation and application of the geomagnetic polarity reversal and secular variation, magnetostratigraphy;
地磁场倒转和长期变的理论、观测和应用以及磁性地层学；
Theory, observation and application of the geomagnetic polarity reversal and secular variation, magnetostratigraphy;
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