Structure of our Earth

1. Inside Our Earth
Class- VIII
Presented by
Gourab Narayan Deb
B.Ed , 4th Semester
KSS Jain College of Education

2. About The Earth
• The Earth, our
homeland is a dynamic
planet.
• It is constantly
undergoing changes
inside and outside.

3. Interior Of The Earth
•Concentric layers with one inside another
•Three layers- Crust,Mantle,Core

4. Crust -
•The uppermost layer
•Thinnest layer
•35 km on the
continental masses
•5 km on the ocean
floors

5. Mantle –
•Situated just beneath the crust
•Extends up to 2900 km
Core –
•Innermost layer
•Radius of about 3500 km
•Nife
•Very high temperature & pressure

6. • Continental masses
are consist of Silica
& Alumina
• It is thus called sial
• Oceanic crust consist
of Silica &
Magnesium
• It is called sima
Sial & Sima

7. Rocks & Minerals
•Earth’s crust consists of
various types of rocks
•Have different colour,
size and texture
•Three major types of
rocks- Igneous,
Sedimentary,
Metamorphic rocks

8. Igneous Rocks
•Primary rocks
•Becomes solid when
molten magma cools
•Two types
-Intrusive rocks
-Extrusive rocks
•Granite is an example
of such a rock

9. Sedimentary Rocks
•Large rocks broken down
into small fragments
•Smaller particles are
called Sediments
•Sandstone is an example
•Contain fossil of plants ,
animals

10. Metamorphic Rocks
•Igneous &
Sedimentary rocks
can change into it.
•Due to great heat
and pressure
•Clay changes into
slate

11. Rock Cycle
•One type of rock
changes into
another type
•Process occurred
in a cyclic manner
•Known as the rock
cycle

12. Thank You