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Seafloor spreading at mid ocean ridges produces magma and later igneous rocks that are mostly basaltic. Being a mafic rock, it ejected from a mid ocean ridge so it is extrusive. Often it is aphanitic and visicular. Basalt is most common on sea floors because the magma that is melted is comprised of mostly mafic rocks.

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Q: Which major kind of rock is formed by seafloor spreading?
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