Question

What is sial
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Answer 1

Answer:

the material of the upper or continental part of the earth's crust, characterized as relatively light and rich in silica and alumina

Answer 2

THIS IS HOW SIAL LOOK..

geology, the term 'sial' refers to the composition of the upper layer of the Earth's crust, namely rocks rich in silicates and aluminium minerals. ... The uppermost layer of the crust is called sial consisting of silicate and Aluminium (Si =silicate, Al= aluminium)