This does not make the crust bigger, because as quickly as new crust is created along the ridge, old crust is dragged down into the mantle and destroyed along deep trenches at the ocean's edge, in a process known by geologists as subduction.
This does not make the crust bigger, because as quickly as new crust is created along the ridge, old crust is dragged down into the mantle and destroyed along deep trenches at the ocean's edge, in a process known by geologists as subduction.