When the magma cools and solidifies, the direction and the polarity of the field are preserved in the magnetized volcanic rock. Reversals of the field give rise to a series of magnetic stripes running parallel to the axis of the rift.
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美
- 巖漿冷卻并凝固下來(lái)后，地磁場(chǎng)的方向和磁極被保留在磁化了的火山巖中，磁場(chǎng)的逆轉形成一系列與斷層軸線(xiàn)平行的條形磁區。
