Question

what is called lower layer of the crust​

Answer 1

Answer:

sima is the word which is lower layer of the crust

Answer 2

Answer:

The 'lower layer' of the 'crust' is called the Sima.

Explanation:

Sima is formed due to rocks that are rich in 'magnesium silicate minerals'. Upper layer crust is formed by sand minerals and lower layer crust is formed by hard rocks.

The frontier between the mantle and crust is called Mohorovicic discontinuity.  

The Earth's crust is of two distinctive types:  

1. Oceanic crust and

2.  Continental crust.

The inceptive is denser and less thick.