Interior of earth

1. Geography Project
Interior of the Earth
Name – Chandan Das
Class – 7 Section – E
Roll no. – 43
Date: 09.09.2020

2. INSIDE THE EARTH
Inside the Earth there are three layers :
 Crust
 Mantle
 Core

3. CRUST
 Crust is the uppermost layer over the Earth
surface.
 It is the thinnest layer on the Earth.
 It is 35 Km thin on the continental masses and
only 5 Km on the ocean floors.
 The main mineral present in the continental
mass are Sial (Silica – Si and Al – Aluminum ).
 In the ocean floor the main mineral is Sima (
Si – Silica and Ma – Magnesium ).

4. MANTLE
 Beneath the Crust there is a another layer known as Mantle.
 It is 2900 km thick layer.
 It lies between Crust and the Core.
 It is made up of dense and heavy materials, such as Iron and
Magnesium.
 The temperature in this layer is very high . Magma is found in
this layer.

5. CORE
It is the innermost layer of the Earth . It
is also known as barysphere.
It is below the Mantle.
The radius of the core is about 3500 km.
It is mainly made up of Nickel and Iron
and is called Nife .
The temperature of this layer is between
2200 degree Celsius and 5000 degree
Celsius.