Question

2.
What is meant by Sima and Sial?​

Answer 1

In geology, sima is the name for the lower layer of the Earth's crust. This layer is made of rocks rich in magnesium silicate minerals. ... The name 'sima' was taken from the first two letters of silica and of magnesia. Comparable is the name 'sial' which is the name for the upper layer of the Earth's continental crust

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