How do magnetic stripes of iron in ocean rock provide evidence of seafloor spreading?

As lava cools into ocean rock, iron-bearing minerals align with Earth’s magnetic field and preserve its direction. Because Earth’s magnetic poles have reversed over time, the rocks form alternating magnetic stripes. The matching, mirror-image stripe pattern on both sides of a mid-ocean ridge shows that new seafloor forms at the ridge and spreads outward, so C is correct.

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