Closer to the ridges 

The ridges of Sannkoffa limits series on paper, New York, 2020

I recently read about mid-ocean ridges, where new oceanic crust is formed through volcanic activity and then gradually moves away from the ridge.

This seafloor mountain system is formed by plate tectonics, precisely seven large plates combined with movements
of a larger number of smaller plates.
It is what I represent here: the seafloor spreading that occurs at mid-ocean ridges.