When the magma cools and solidifies, the direction and the polarity of the field are preserved in the magnetized volcanic rock.
岩浆冷却并凝固下来后，地磁场的方向和磁极被保留在磁化了的火山岩中。
When the magma cools and solidifies, the direction and the polarity of the field are preserved in the magnetized volcanic rock.
岩浆冷却并凝固下来后，地磁场的方向和磁极被保留在磁化了的火山岩中。
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