What is meant by Sima and Sial?
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Sima and Sial
In geology, sima (/ˈsaɪmə/) is an antiquated blended term for the lower layer of Earth's crust. This layer is made of rocks rich in magnesium silicate minerals. ... Comparable is the name 'sial' which is the name for the upper layer of Earth's crust (continental crust)
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sima - silica and magnesium
sial - silica and aluminium
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