Question

Sima layer is composed of rocks rich in _ and _.

Answer 1

Answer:

rich in Magnesium ..........

Answer 2

Sima layer is composed of rocks rich in Silicon and Magnesium

Explanation:

• The internal structure of the earth is broadly divided into three parts :-

1. Crust
2. Mantle
3. Core

• Out of these, Crust can be divided into two categories:-

1. The Upper Crust(Sial)
2. The Lower Crust(Sima)

• In the sialic layer is composed of rocks rich in silicon and aluminium.It is present both in continents in (majority) as well as in oceans.
• Sima layer is composed primarily of Magnesium silicate minerals.The oceanic crust is mainly composed of Sima.