Earth’s motions are classified according to the factors that cause them. Endogenic forces operate within the earth’s interior, whereas exogenic forces operate on its surface. Earthquakes and volcanic eruptions wreak havoc on the earth’s surface. Weathering and erosion are two processes that continually erode the terrain. Chapter 3 sheds light on all these important topics. There is a set of questions given at the end of each chapter in the NCERT textbook, and students must solve these questions to understand the concepts in a better way.
Students can access NCERT Solutions for Class 7 Geography Chapter 3 on Extramarks to get answers to all the textbook questions. The solutions will help students in improving their conceptual understanding and will be able to answer any question asked in the examination no matter how tweaked they are.
NCERT Solutions for Class 7 Social Science Chapter 3 – Our Changing Earth – Download
Access NCERT Solutions for Class 7 Social Science (Geography) Chapter 3 – Our Changing Earth
NCERT Solutions for Class 7 Social Science Download
The NCERT Solutions are prepared in simple and easy-to-understand language to help students grasp the concepts effectively. The solutions are accessible on the website and app of Extramarks.
An Overview of the NCERT Class 7 Geography Chapter 3 Notes
The notes for Class 7 Geography Chapter 3 cover several areas of Geography. Let’s look at some important topics:
- Lithospheric Plates: The lithosphere is broken into a number of plates called the Lithospheric plates. Because of the movement of molten magma inside the earth, the lithospheric plate gets broken into different plates and continues to move around slowly.
- The molten magma inside the earth continues to move in a circular motion. These movements are further divided on the basis of endogenic and exogenic factors. Endogenic forces, which occur in the interior, cause unexpected activities that result in earthquakes and volcanic eruptions. Exogenic forces, also known as exogamic forces, work on the surface of the earth.
- Volcano: A volcano is a vent in the crust of the earth. Molten material comes out of the volcano.
- Earthquake: When lithospheric plates move, the vibration of the earth travels across, causing earthquakes.
- Epicentre: The epicentre is the point at which the actual movement of lithospheric plates occurs. Waves travel from the epicentre to other locations.
Major Landforms:
The chapter provides detailed information about how the landscape wears out through two different processes: weathering and erosion.The breaking up of rocks on the earth’s surface is referred to as weathering.
- Erosion is the process of the terrain getting eroded by various factors such as water, wind, and ice. Water and wind carry away the eroded material. Different landforms are formed due to the processes of erosion and deposition.
Work of Sea Waves
Changes in sea waves also contribute to a changing ecosystem. Here are some ways sea waves change:
- Sea Caves: Coastal landforms are formed due to erosion and deposition, which also keep rocks from striking each other and lead to cracks. These cracks keep on growing over time, creating caves.
- Sea Arches: When cavities in the rock get larger, arches form.
- Sea Cliff: Seacliff is a steep rocky coast that rises vertically and in different shapes.
Work of Wind
Aside from the water and the land, the wind also plays a major role in modifying landforms. The wind blowing in the desert is an active agent of erosion and deposition. On the other hand, sand dunes are formed when the wind carries sand from one location to another. When the wind stops blowing, the sand settles down. This area is called sand dunes.
Class 7 Geography Chapter 3 Notes
NCERT Class 7 Geography Chapter 3 notes are now available on Extramarks, which makes learning simple and more effective.. The solutions provide accurate information about a specific topic ,which allows students to gain in-depth knowledge.
NCERT Class 7 Social Science Our Environment Chapterwise Solutions
Extramarks provides the following NCERT Class 7 Social Science Chapter wise Solutions:
- Chapter 1 – Environment
- Chapter 2 – Inside Our Earth
- Chapter 3 – Our Changing Earth
- Chapter 4 – Air
- Chapter 5 – Water
- Chapter 6 – Natural Vegetation and Wildlife
- Chapter 7 – Human Environment-Settlement, Transport and Communication
- Chapter 8 – Human Environment Interactions – The Tropical and the Subtropical Region
- Chapter 9 – Life in the Deserts
NCERT Solutions for Class 7 Social Science
NCERT Solutions for Class 7 Social Science have the most appropriate answers to all of the questions from the Social Science textbook. The study materials include clear explanations and comprehensive discussions. Academic experts with years of experience have prepared these solutions as per the NCERT books while adhering to the recent CBSE syllabus.