earth's magnetism

例句：

1. 1. The earth's magnetism is responsible for the movement of the planets.
   地球的磁性是行星运动的原因。
2. 2. The study of geomagnetism is important for understanding the behavior of the Earth's core.
   研究地磁学对于理解地球内核的行为非常重要。
3. 3. The earth's magnetism can be used to detect magnetic anomalies in the Earth's crust.
   地球的磁性可以用来探测地壳中的磁异常。