User talk:Mahmoud mugahed

--Thereen (discuss • contribs) 20:04, 6 November 2011 (UTC)

Formation of the Earth
Earth crust: the Earth is composed of three layers the crust, mantal and the core. The crust is the outermost layer mantle the entermediate layer and core is the innermost layer. The crust of the Earth is seismically defined as the solid Earth above the Mohorovicic discontinuity or in short, simply moho. The crust is thin, rocky veneer that constitutes the continents and the floors of the oceans and is not a homogenous shell. There are two distinct kinds of crust, which, because of their distinctive compositions and physical properties, determine the very existence of separate continents and ocean basins.--Mahmoud mugahed (discuss • contribs) 20:36, 10 November 2011 (UTC)