First floor: Floor Sial (sial) is a crust on the top floor. Mineral silica and alumina, which is a type of granite. For the surface of this layer is a sedimentary rock. Sial layer is only part of the continental crust only. The crust beneath the seas and oceans will no sedimentary this
second layer: shale Masai (sima) is a sedimentary rock layers beneath the site al-down. Most of the basalt mineral silica. Iron and magnesium Masai shale is wrapped around the earth, in the seas and oceans. Unlike rock Syed Al-covered portion of the continent. There is a dense layer Sial.