Oceanic crust Oceanic crust Oceanic crust is the uppermost layer of the oceanic portion of a tectonic plate. It is composed of the upper oceanic crust, with pillow lavas and a dike complex, and the lower oceanic crust, composed of troctolite, gabbro and ultramafic cumulates. The crust overlies the solidified and uppermost layer of the mantle. The crust and the solid mantle layer together constitute oceanic lithosphere. Oceanic crust is primarily composed of mafic rocks, or sima, which is rich in iron and magnesium. It is thinner than continental crust, or sial, generally less than 10 kilometers thick; however it is denser,
Between the Earth & Sky an Explanation)." All songs composed by Luba. Between the Earth & Sky Between the Earth & Sky is a follow-up release to the breakout album "Secrets and Sins" by Canadian singer, Luba and her band. The album helped Luba win a second Juno Award for "Female Vocalist of the Year", and was also her first album to go platinum in Canada. Various musical artists appear on "Between the Earth & Sky", including a saxophone solo by jazz musician Kenny G on the hit single "How Many" (produced by Narada Michael Walden). Other popular singles on the album include "Strength In