Please enable JavaScript.
Coggle requires JavaScript to display documents.
Internal Structure of Earth (Other Important things to remember (Taj…
Internal Structure of Earth
How was the Earth formed?
It happened 4.5 billion years ago
Earth was a round ball of
homogeneous molten material
revolving around the sun.
As the liquid slowly cooled down the denser materials that form the earth solidified and sank to the center.
The
lighter less dense elements
were pushed out towards the surface where they formed Earth's crust.
Layers of Earth
Solid crust
Thinnest layer
Outermost Layer
Earth as football- 1/2 mm thick
Continental Crust
Sial (Silica + Alumina)
Max. 35 kms. thick
Thinnest in Rift valley, East Africa
Thickest under mountain ranges
Oceanic Crust
Sima (Silica+Magnesium)
About 5 kms. thick
0.5 to 1% of Earth's volume
Mantle
Highly vicous
semi-solid
2900 km thick
83% of earth's volume
Does not flow freely
Core
Inner core
Solid due to high pressure
5000 C to 6000 C
Outer core
Liquid
Nife (Nickel + Iron)
16% of earth's volume
Radius of about 3500 km
Volcanoes
Magma released on the surface of the Earth is called lava.
When the Earth's crust gets erupted
the hot molten magma, ash and gases
come out from the core to the surface
of the Earth. This forms volcanoes.
Hawaiian island formed due to undersea volcanic activities.
Other Important things
to remember
Taj Mahal is made up of
White marble and Red
Fort of Red Sandstone
The process of transformation of the rock
from one to another is called rock cycle
The remains of dead animals
and plants trapped in
layers of rock are called fossils.
Sandstone - Sedimentary rock
Intrusive Rocks-
Magma cools down slowly.
They form large grains.
Magma cools inside the crust.
Eg., granite
Extrusive Rocks-
Magma cools down rapidly.
They have very fine grained structure.
Magma cools outside the crust.
Eg., basalt
Importance of Rocks-
The hard rocks are used for
making roads, houses buildings.
For making jewelry.