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Outer portion of the earth
Answer for the clue "Outer portion of the earth ", 4 letters:
sial
Alternative clues for the word sial
Word definitions for sial in dictionaries
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" ...
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
Usage examples of sial.
The upper and lighter layer, fifteen miles thick, was composed of lighter rock known by the invented word sial, indicating silicon and aluminum.