Write four difference between SIAL and SIMA

It is earths crusts upper layer It is the lower layer of the earths crust
Made up of those rocks rich in silicate and aluminium rich elements Made up of the rocks rich in magnesium silicate rich minerals
It forms continental crust It forms oceanic crust

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the sial is also known as upper continental crust and the sima is also known as lower oceanic crust 
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sial is the combination os silica and alluminium and sima is the combination of silica and magnesium
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