ALL meanings of sial
si·al
S s - noun sial the assemblage of rocks, rich in silica and alumina, that comprise the continental portions of the upper layer of the earth's crust. 1
- noun sial the silicon-rich and aluminium-rich rocks of the earth's continental upper crust, the most abundant individual rock being granite 0
- noun sial the upper layer of the crust of the earth, consisting of rocks rich in silica and alumina 0