As magma rises under the mid-ocean ridge, ferromagnetic minerals in the magma become magnetized in the direction of the magma become magnetized in the direction of the geomagnetic field.
2
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.
3
当岩浆从中海脊下涌起的时候，岩浆中的磁铁矿物质按地磁场的方向被磁化。
As magma rises under the mid-ocean ridge, ferromagnetic minerals in the magma become magnetized in the direction of the geomagnetic field.
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