why are continental masses also called sial
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The continental mass is also called 'sial'. The name sial is derived from letters 'si' of silicon and 'al' of alumina. The main mineral constituents of the oceanic crust are: silicon
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continental masses are also known as SiAl as they are mainly constituted of silicon and aluminium and has a density of 2.7 g per cc and is lighter than the oceanic crust and floats on it.
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