地磁的

例句：

1. 1. The earth's magnetic field is responsible for many natural phenomena.
   地球的磁场负责许多自然现象。
2. 2. The scientists found that the earth's magnetic field has been weakening over time.
   科学家们发现地球的磁场随着时间的推移而减弱。
3. 3. The study of geomagnetism is important for understanding the earth's internal structure.
   研究地磁学对于理解地球的内部结构非常重要。