Question

Out of which layer of the crust is most of the oceanic base formed?​

Answer 1

Oceanic crust is continuously being created at mid-ocean ridges. As plates diverge at these ridges, magma rises into the upper mantle and crust. As it moves away from the ridge, the lithosphere becomes cooler and denser, and sediment gradually builds on top of it.

Answer 2

answer:

AS PLATES DIVERGE AT THESE RIGES , MAGMA RISES INTO THE UPPER MANTLE AND CRUST