NCERT Solutions for Class 7 Social Science Geography Chapter 2

NCERT Solutions for Class 7 Social Science Geography Chapter 2 Inside Our Earth (अध्याय 2: हमारी पृथ्वी के अंदर) free to View online or download in PDF form for session 2020-21 following the latest NCERT Books.

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NCERT Solutions for Class 7 Social Science Geography Chapter 2

Class:7
Subject:Social Science – Geography
Chapter 3:Inside Our Earth

Class 7 Geography Chapter 2 Question Answers

CBSE NCERT Solutions for Class 7 Social Science Geography Chapter 2 Inside Our Earth is given below in updated form for session 2020-21. Offline apps 2020-2021 and NCERT Textbook solutions can be used offline also without internet.



Important Notes on 7th Geography Chapter 2

The uppermost layer over the earth’s surface is called the crust. It is the thinnest of all the layers. It is about 35 km. on the continental masses and only 5 km. on the ocean floors. The oceanic crust mainly consists of silica and magnesium; it is therefore called sima (si-silica and ma-magnesium).
The innermost layer is the core with a radius of about 3500 km. It is mainly made up of nickel and iron and is called nife (ni – nickel and fe – ferrous i.e. iron). The central core has very high temperature and pressure.




Do you Know?
What do you understand by Primary Rocks?

Primary Rocks:
Any natural mass of mineral matter that makes up the earth’s 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. When the molten magma cools, it becomes solid. Rocks thus formed are called igneous rocks. They are also called primary rocks. There are two types of igneous rocks: intrusive rocks and extrusive rocks.

What is meant by Igneous Rocks?

Igneous Rocks:
When molten lava comes on the earth’s surface, it rapidly cools down and becomes solid. Rocks formed in such a way on the crust are called extrusive igneous rocks. They have a very fine grained structure. For example, basalt. The Deccan plateau is made up of basalt rocks. Sometimes the molten magma cools down deep inside the earth’s crust. Solid rocks so formed are called intrusive igneous rocks.

What is Sedimentary Rocks?

Sedimentary Rocks:
Rocks roll down, crack, and hit each other and are broken down into small fragments. These smaller particles are called sediments. These sediments are transported and deposited by wind, water, etc. These loose sediments are compressed and hardened to form layers of rocks. These types of rocks are called sedimentary rocks. For example, sandstone is made from grains of sand. These rocks may also contain fossils of plants, animals and other microorganisms that once lived on them.



Class 7 Social Science – Geography Chapter 2 – Important Questions

What are the three layers of the earth?
Three layers of the Earth are
Crust
Mantle
Core
What is a rock?
Any natural mass of mineral matter that makes up the earth’s crust is called rock. Rocks can be of different colour, size and texture.
Name three types of rocks.
There are three types of rocks:
Igneous rock or primary rocks
Sedimentary rock.
Metamorphic rock.
How are extrusive and intrusive rocks formed?
Formation of Extrusive rocks and Intrusive rocks:
Extrusive rocks are formed due to rapid cooling and solidification of molten magma on the earth’s surface.
Intrusive rocks are formed when molten magma cools down deep inside the earth’s crust.
What do you mean by a rock cycle?
The change of one type of rock into another type under certain conditions in a cyclic manner is called a rock cycle.
What are the uses of rocks?
Following are some uses of rocks:
They are used as fuels.
They are used in industries.
They are used in medicines.
They are used in fertilizers.
They are used in making roads, houses, building, etc.
What are metamorphic rocks?
The types of rocks formed when igneous and sedimentary rocks undergo heat and pressure are called metamorphic rocks.
Why can we not go to the centre of the earth?
We cannot go to the centre of the earth because at the centre of the Earth the temperature as well as pressure is extremely high. Not only human being but also rocks and metals get melted at this condition.
Sedimentary rocks are formed from sediments. Why?
Rocks breakdown into small fragments under various conditions. These fragments, called sediments, are transported by wind and water. Layers of sediments are formed when loose sediments are compressed and hardened. These layers of sediments thus form sedimentary rocks.
Limestone is changed into marble.
Ingenious and sedimentary rocks change their form under great pressure and temperature conditions to form metaphoric rocks. The same thing happens with limestone, which under the effect of heat and pressure change into marble, which is an example of metamorphic rock.
NCERT Solutions for Class 7 Social Science Geography Chapter 2.
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