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2015-10-23T17:00:59+05:30

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The main mineral constituents of the continental mass of the earth's crust is silica and alumina.It is called Sial.And the oceanic part of the earth's crust is made of silica and magnesium called Sima.
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2015-10-23T17:02:44+05:30

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the earths crust is made up of several elements
The most common chemical elements in the crust are oxygen (46.6%), silicon (27.7%), aluminum (8.1%), iron (5.0%), calcium (3.6%), potassium (2.8)%, sodium (2.6%), and magnesium (2.1%).
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