According to Vine and Matthews, paleomagnetism is what caused the magnetic striping.
- Seafloor spreading caused the oceanic crust to drift away from the mid-oceanic ridges, which was revealed by the striping as magnetic reversals in the Earth's poles. As a result, magnetic striping on the ocean floor demonstrates how the continents move and shows that the sea floor is expanding away from the mid-ocean ridges. When basalt erupts along the ridges, it forces the existing crust away from the ridge, resulting in the formation of new oceanic crust and the spreading of the sea floor.
- A new stripe with a new polarity starts as the Earth's magnetic field flips. Such magnetic patterns are among the greatest pieces of evidence supporting the hypothesis of plate tectonics, and they helped to establish the occurrence of sea-floor spreading.
Thus this is how magnetic striping support the theory of seafloor spreading.
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