Inside our Earth Class 7 Notes | EduRev

Class 7 : Inside our Earth Class 7 Notes | EduRev

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The earth our home leg is a diabetic planet it is constantly undergoing changes inside and outside.


Interior of the earth

Our Earth is covered by the layers

Crust mantle and core

Crust the uppermost layer over the Earth's surface is called crust it is the thinnest of all the layers it is about 35 km on the continental masses and only 5 kilometre on the ocean floor.


The main mineral.  constituent of the continental mass are silica and Aluminium . IIT is first called sial. Just beneath the crust is the mental which extend off to depth of 2900 km below the crust the innermost layer is the core switch a radius about 3500 km it is mainly made up of nickel and iron and is called life the central court has very high temperature.

Rocks and minerals


the earth's crust is made up of various type of rocks any natural number or minerals matter that makes of the earth crust is called a rock rocks can be of different colour size and texture.


there are three major types of rocks igneous rocks sedimentary rocks and metamorphic rocks.


Igneous rocks


when the molten magma schools in becomes solid Rock stars from and called igneous rocks are also called primary rocks there are two different types of igneous rocks extrusive rocks inclusive rocks.

Extrusive igneous rocks 


When the molten lava comes on the surface of the earth it rapidly cools down and become solid rocks formed in such a way on the cross are called extrusive igneous rocks they have a very fine grained structure for example basalt.

Intrusive igneous rocks

when the molten magma cools deep inside the earth crust solid Rock so formed are called instrusive igneous rocks.

Sedimentary rocks.

Rocks roll down crack and hit each other and are broke down into small particles call sediment s .

When the sediment are deposit by the help of wind water etc. this loss sediments are compressed to form a layer of Rock.

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