Read and download NCERT Class 7 Geography Our Changing Earth in NCERT book for Class 7 Social Science. You can download latest NCERT eBooks chapter wise in PDF format free from Studiestoday.com. This Social Science textbook for Class 7 is designed by NCERT and is very useful for students. Please also refer to the NCERT solutions for Class 7 Social Science to understand the answers of the exercise questions given at the end of this chapter
NCERT Book for Class 7 Social Science Our Environment Chapter 3 Our Changing Earth
Class 7 Social Science students should refer to the following NCERT Book Our Environment Chapter 3 Our Changing Earth in Class 7. This NCERT Book for Class 7 Social Science will be very useful for exams and help you to score good marks
Our Environment Chapter 3 Our Changing Earth NCERT Book Class 7
Our Changing Earth
The lithosphere is broken into a number of plates known as the Lithospheric plates. You will be surprised to know that these plates move around very slowly – just a few millimetres each year. This is because of the movement of the molten magma inside the earth. The molten magma inside the earth moves in a circular manner as shown in the activity.
The movement of these plates causes changes on the surface of the earth. The earth movements are divided on the basis of the forces which cause them. The forces which act in the interior of the earth are called as Endogenic forces and the forces that work on the surface of the earth are called as Exogenic forces (Fig. 3.1) Endogenic forces sometimes produce sudden movements and at the other times produce slow movements. Sudden movements like earthquakes and volcanoes cause mass destruction over the surface of the earth.
A volcano is a vent (opening) in the earth’s crust through which molten material erupts suddenly (Fig. 3.2) Similarly, when the Lithospheric plates move, the surface of the earth vibrates. The vibrations can travel all round the earth. These vibrations are called earthquakes (Fig. 3.3). The place in the crust where the movement starts is called the focus. The place on the surface above the focus is called the epicentre. Vibrations travel outwards from the epicentre as waves.
Greatest damage is usually closest to the epicentre and the strength of the earthquake decreases away from the centre. Although earthquakes cannot be predicted, the impact can certainly be minimised if we are prepared before-hand. Some common earthquake prediction methods adopted locally by people include studying animal behaviour; fish in the ponds get agitated, snakes come to the surface.
MAJOR LAND FORMS Do you know?
The landscape is being continuously worn away by two processes – weathering and erosion. Weathering is the breaking up of the rocks on the earth’s surface. Erosion is the wearing away of the landscape by different agents like water, wind and ice. The eroded material is carried away or transported by water, wind, etc. and eventually deposited. This process of erosion and deposition create different landforms on the surface of the earth.
Exercises
1. Answer the following questions.
(i) Why do the plates move?
(ii) What are exogenic and endogenic forces?
(iii) What is erosion?
(iv) How are flood plains formed?
(v) What are sand dunes?
(vi) How are beaches formed?
(vii) What are ox bow lakes?
2. Tick the correct answer.
(i) Which is not an erosional feature of sea waves?
(a) Cliff (b) Beach (c) Sea cave
(ii) The depositional feature of a glacier is:
(a) Flood plain (b) Beach (c) Moraine
(iii) Which is caused by the sudden movements of the earth?
(a) Volcano (b) Folding (c) Flood plain
(iv) Mushroom rocks are found in:
(a) Deserts (b) River valleys (c) Glaciers
(v) Ox bow lakes are found in:
(a) Glaciers (b) River valleys (c) Deserts
3. Give reasons.
(i) Some rocks have a shape of a mushroom.
(ii) Flood plains are very fertile.
(iii) Sea caves are turned into stacks.
(iv) Buildings collapse due to earthquakes.
Please refer to attached file for NCERT Class 7 Geography Our Changing Earth
NCERT Class 7 Civics Understanding Advertising |
NCERT Class 7 Geography Life in the Temperate Grasslands |
NCERT Class 7 History The Creation Of An Empire |
NCERT Class 7 Geography Environment |
NCERT Class 7 Geography Inside Our Earth |
NCERT Class 7 Geography Our Changing Earth |
NCERT Class 7 Geography Air |
NCERT Class 7 Geography Water |
NCERT Class 7 Geography Natural Vegetation and Wild Life |
NCERT Class 7 Geography Human Environment |
NCERT Class 7 Geography Human Environment Interactions |
NCERT Class 7 Geography Life in the Deserts |
NCERT Class 7 History Tracing Changes Through a Thousand Years |
NCERT Class 7 History New Kings And Kingdoms |
NCERT Class 7 History The Delhi Sultans |
NCERT Class 7 History Our Pasts 2 The Mughal Empire |
NCERT Class 7 History Rulers And Buildings |
NCERT Class 7 History Towns Traders And Craftsperson |
NCERT Class 7 History Tribes Nomads |
NCERT Class 7 History Devotional Paths |
NCERT Class 7 History The Making Of Regional Cultures |
NCERT Class 7 History Eighteenth Century Political Formations |
NCERT Class 7 Civics Equality in Indian Democracy |
NCERT Class 7 Civics State Government |
NCERT Class 7 Civics How the State Government Works |
NCERT Class 7 Civics Gender |
NCERT Class 7 Civics Women Change the World |
NCERT Class 7 Civics Media and Advertising |
NCERT Class 7 Civics Markets Around Us |
NCERT Class 7 Civics A Shirt in the Market |
NCERT Class 7 Civics Struggles For Equality |
Social Science NCERT Book Class 7 Our Environment Chapter 3 Our Changing Earth
The above NCERT Books for Class 7 Social Science Our Environment Chapter 3 Our Changing Earth have been published by NCERT for latest academic session. The textbook by NCERT for Our Environment Chapter 3 Our Changing Earth Social Science Class 7 is being used by various schools and almost all education boards in India. Teachers have always recommended students to refer to Our Environment Chapter 3 Our Changing Earth NCERT etextbooks as the exams for Class 7 Social Science are always asked as per the syllabus defined in these ebooks. These Class 7 Our Environment Chapter 3 Our Changing Earth book for Social Science also includes collection of question. We have also provided NCERT solutions for Class 7 Social Science which have been developed by teachers of StudiesToday.com after thorough review of the latest book and based on pattern of questions in upcoming exams for Class 7 students.
NCERT Book Class 7 Social Science Our Environment Chapter 3 Our Changing Earth
The latest NCERT book for Our Environment Chapter 3 Our Changing Earth pdf have been published by NCERT based on the latest research done for each topic which has to be taught to students in all classes. The books for Class 7 Social Science Our Environment Chapter 3 Our Changing Earth are designed to enhance the overall understanding of students. All Class 7 NCERT textbooks have been written in an easy to understand language which will help to enhance the overall level of Class 7 students.
Our Environment Chapter 3 Our Changing Earth NCERT Book Class 7 Social Science
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Class 7 Social Science Our Environment Chapter 3 Our Changing Earth NCERT Book
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Class 7 Our Environment Chapter 3 Our Changing Earth NCERT Book Social Science
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