Interior of the Earth In this article, we will study the interior of the earth diagram, three layers of the earth Crust, Mantle, and Core chapter 2 of Class 7 Social science Geography Inside our earth class 7 notes

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September 24, 2018
Inside Our Earth | Interior of the Earth – Class 7
Geography(Social Science)
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Interior of the earth diagram
Planet Earth
Earth is a dynamic planet where hum beings live. The radius of the earth is 6731 km. it is not
absolute spherical in shape. Constant changes occur inside and outside the earth.
Interior of the earth / Inside our earth / Describe the interior
of the earth
Earth is just like an onion which is made of several layers of the earth with one inside
another.
Three layers of the earth
The three layers of the earth are as follows-
Crust
It is the uppermost layer of the earth and thinnest among all the layers. It is 5 km from the
ocean floor and 35 km from the continental mass. It is formed from the 0.5% of the total
earth’s surface and it is less than 1 % of earth’s volume. The crust is fragmented with many
plates which float on the mantle. When these plates come closer and get hit, it results in an
earthquake
The crust is of two types

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1. Continental crust (under the land)- This layer is also known as si-al where si refers
to silica and al refers to aluminum as they are the main mineral constituents of the
continental mass
2. Oceanic crust (under the ocean)-The ocean crust is made of Silica and magnesium,
hence it is also known as Sima.
Mantle
Beneath the crust is the mantle. It extends up to the depth of 2900 km. it forms the 16% of
the total volume of the earth’s surface. It is the thickest layer of the earth. It consists of hot
dense and semi-solid rocks. It is made of silicate rock which is made of iron and magnesium.
The upper portion of the mantle is called asthenosphere and it is the main source of magma.
It is composed of dense rocks.
Core
It is the innermost layer of the earth. It has the radius of about 3500km. It is made of nickel
and iron and called nife(ni-nickel and fe-ferrous). It has a very high temperature and
pressure. It covers 83% of the total volume on the earth. It contains the heavier mineral
material of higher density,
The core is of two types
1. Outer core– it consists of nickel and iron and it is the liquid most layer. It is 2266 km
from the surface. It mainly consists of nickel and iron. Earth’s magnetic field is created
in this core.
2. Inner core– it is the earth’s innermost part. It is in solid form. It has the radius of about
1200 km.
Continue the next part ….
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August 18, 2021
Class 7 Geography(Social Science)
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