Oceanic lithosphere is produced at ocean ridges and cools, thickens, and increases in age as in moves away ridges. Between the oceanic lithosphere and asthenosphere may be a thermal physical phenomenon. Oceanic lithosphere is often about 50-100 km thick (but beneath the mid-ocean ridges is not any thicker than the crust). The continental lithosphere is thicker (about 150 km. New oceanic lithosphere is created by frequent volcanic eruptions along the length of mid-ocean ridges and is pushed outward from them gradually. it's bounded by the atmosphere above and also the asthenosphere (another a part of the upper mantle) below. Oceanic lithosphere consists mainly of mafic crust and ultramafic mantle (peridotite) and is denser than continental lithosphere. Young oceanic lithosphere, found at mid-ocean ridges, is not any thicker than the crust, but oceanic lithosphere thickens because it ages and moves far from the mid-ocean ridge. the identical crop over and over strips vital nutrients within the lithosphere .