What is meant by Sima and Sial? (Short Answer)
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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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sial- It is upper layer which form a discontionous cover over the earth crust.
sima- it is second layer below sial which form the ocean base.
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