Sima vs. Sial

Simanoun

(architecture) The upturned edge of a roof which acts as a gutter; a cyma.

Simanoun

(geology) The lower layer of the earth's outer crust that underlies the sial and is rich in silica, iron, and magnesium.

Simanoun

A cyma.

Simanoun

rock that form the continuous lower layer of the earth's crust; rich in silicon and magnesium

Sialnoun

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

Sialnoun

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

Sial

In geology, the term sial refers to the composition of the upper layer of Earth's crust, namely rocks rich in aluminium silicate minerals. It is sometimes equated with the continental crust because it is absent in the wide oceanic basins, but 'sial' is a geochemical term rather than a plate tectonic term.