Definition of sial in English:

sial

Syllabification: si·al
Pronunciation: /ˈsīˌal
 
/

noun

Geology
The material of the upper or continental part of the earth’s crust, characterized as being of relatively low density and rich in silica and alumina. Contrasted with sima.
More example sentences
  • The rocks found in the crust of the continents is called sial.
  • A mnemonic term derived from for silica, for alumina, and for magnesium, applied as a compositional term to a layer within the Earth that occupies a position intermediate between sial and sima.

Origin

1920s: from the initial letters of silica and alumina.

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