The rock type that forms at new seafloor spreading centers is

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Basaltic rock forms at new seafloor spreading centers as a result of volcanic activity and magma coming to the surface. This type of rock is typically dark-colored, dense, and fine-grained. Andesitic, rhyolitic, and granitic rocks are primarily formed through different types of volcanic activity or from the cooling of magma underground, and are not typically associated with new seafloor formation.

The Rock Type That Forms at New Seafloor Spreading Centers