Some of the upper crust is backing a Liberal

• Rich in silicon and aluminum
• The granite-like rocks that form the outermost layer of the earth's crust
• Upper layer of earth's crust
• Rock formation
• Earth's crust

WordNet Word definitions in WordNet
n. the granite-like rocks that form the outermost layer of the earth's crust; rich in silicon and aluminum

Wikipedia Word definitions in Wikipedia
In geology , the sial refers to the composition of the upper layer of the Earth 's crust , namely rocks rich in silicates and aluminium minerals. It is sometimes equated with the continental crust because it is absent in the wide oceanic basins , but "sial" ...

Wiktionary Word definitions in Wiktionary
n. (context geology English) The rocks rich in silicon and aluminum that form the upper layer of the earth's crust, which lies beneath all continental landmasses.