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Definition of Sial
1. Noun. The granitelike rocks that form the outermost layer of the earth's crust; rich in silicon and aluminum.
Definition of Sial
1. a type of rock formation [n -S] : SIALIC [adj]
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1. Noun. The granitelike rocks that form the outermost layer of the earth's crust; rich in silicon and aluminum.
1. a type of rock formation [n -S] : SIALIC [adj]