At the ridge, which wraps itself around the world's oceans much like the seams on a baseball, volcanic activity slowly releases magma from the earth's mantle into the bottom of the ocean which forms new oceanic crust.
(the ridge; wraps; itself; around the world's oceans) (volcanic activity; slowly releases; magma; from the earth's mantle; L:At the ridge) (the ocean; forms; new oceanic crust)
the ridge volcanic activity the ocean
wraps slowly releases forms
itself around the world's oceans
magma from the earth's mantle L:At the ridge
new oceanic crust