Answer: Ocean crust is continuously formed at mid- ocean ridge. As the plates separates at these ridges and the surrounding magma rises into the upper crust and mantle.
As it moves away from the ridge, the lithosphere seems to be cooler and denser and the sediments built on the top. The youngest layer is created at the oceanic ridge and the older ones get away with time.
Example of ocean crust is Gakkel ridge under atlantic ocean
