A
Sea floor spreading occurs in divergent boundaries where new crust is being formed
Explanation:
The earth's magnetic field is NOT static. There have been about 4 -5 flips in the last 10 million years. Earth's magnetic field affects the orientation of highly ferromagnetic ions on earth such as iron. These ions align with the earth's magnetic fields. Magma has significant iron content and when it gets to the surface, these ions align with the earth's magnetic fields before the magma cools to solid rock forming bands on the rocks. At divergent boundaries, these bands are evident on the newly formed crust when magma rises to replace the void from the diverging tectonic plates. Some of these bands align in the opposite orientation and provide evidence of when the earth’s magnetic field flipped. Even during magma flow in a volcanic eruption, when the magma, with high iron content, cools, bands on the rocks are evident due to this phenomenon.
Learn More:
Learn more about tectonic plates here;
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