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how do studies of the magnestism of rocks on the seafloor provide evidence that the surface of the earth moves over time

User Fhossfel
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If you look at the "memory" of the rocks being created and moving away from each other at the mid-Atlantic ridge, you can see where the magnetic poles flipped from north to south and back again.

Looking at the rocks each side of the ridge shows that they are magnetic mirror images of each other and therefore that the surface of the Earth (at this point) is moving away from the ridge.
User Yotamoo
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