Geography
What is Earth’s crust composed of?
Earth's Structure
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Answer
The earth's crust consists of two layers - SIAL and SIMA.
The material of the upper or continental part of the earth's crust, characterized by relatively low density is called the SIAL layer.The SIAL layer has predominance of Silica and Aluminium. It is also known as granite layer which floats on SIMA.
The lowest layer of the earth's outer crust that underlies the SIAL is SIMA layer. It consists of Silica and Magnesium and it is also known as basaltic layer.
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