nimat told her friend that today at school her teachers told them that the earth's crust is made up the elements. On the basis , the top leyer of the earth which is called Sial
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crust
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The uppermost layer of the crust is called the sial, consisting of silicate and aluminium (Si = silicate, Al = aluminium). On average, the thickness of the sial is till 25 km from the surface.
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