spreading ridges form both magmatic and amagmatic (currently lack volcanic activity) ridge segments without transform faults.

Volcanism

Mid-ocean ridges exhibit active volcanism and seismicity. The oceanic crust is in a constant state of 'renewal' at the mid-ocean ridges by the processes of seafloor spreading and plate tectonics. New magma steadily emerges onto the ocean floor and intrudes into the existing ocean crust at

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