Question

Differentiate between SIAL and SIMA.

Mention three points of difference between SIAL and SIMA.

Answer 1

Sr. No.	SIAL	SIMA
1.	The uppermost part of the earth’s crust is this one.	This is below the sial layer.
2.	Its thickness is nearly 20 km.	Its average thickness is about 25 to 30 km.
3.	It is composed of silica (Si) and aluminium (Al).	It is composed of silica (Si) and magnesium (mg).
4.	It is not a continuous layer. It is not found on the ocean basin.	It is a continuous layer.
5.	It is less dense.	It is more dense.
6.	It is a granite layer.	It is a basaltic layer.