NCERT Solutions For Class 7 Social Science Our Environment Chapter 2 Inside Our Earth - 2025-26
Start learning with Vedantu's NCERT Solutions for Class 7 Geography Chapter 2, Inside Our Earth. Access detailed and clear explanations of key concepts with our Class 7 Geography NCERT Solutions to enhance your understanding of the subject with easy-to-follow, step-by-step solutions provided by Vedantu.
Table of Content
By exploring Inside Our Earth Class 7, students can deeply understand key concepts such as the structure of the Earth, types of rocks, and the rock cycle as outlined in the curriculum. This comprehensive resource ensures a thorough grasp of the material, enhancing students' knowledge and preparation. Check out the revised class 7 social science syllabus and start with Vedantu for academic excellence.
Glance on NCERT Solutions for Class 7 Geography Chapter 2 Inside Our Earth
Class 7th Geography Chapter 2, Inside Our Earth, delves into the fascinating structure of the Earth.
This chapter inside our Earth Class 7 explains the different layers that make up our planet, providing insights into their composition and characteristics.
The chapter emphasises the importance of geological studies and how they contribute to our knowledge of the natural world.
Students learn about the three main layers - the crust, mantle, and core discussed in Inside our Earth Class 7 Questions and Answers.
The chapter covers various types of rocks, including igneous, sedimentary, and metamorphic rocks.
The chapter inside our earth class 7 also touches upon natural phenomena such as earthquakes and volcanic eruptions, explaining their causes and effects.
It also describes in detail the various components of the environment in Geography Class 7 Chapter 2, which include man-made components, natural components (air, water, land, and living things), and human components.
Students will also be able to learn about life on different terrains, including temperate grasslands, deserts, etc.
1. Answer the following questions:
(i) What are the three layers of the earth?
Ans: The three layers of the earth are core, mantle, and crust.
(ii) What is a rock?
Ans: Any natural mass of mineral materials that makes up the earth's crust is referred to as a rock.
(iii) Name three types of rocks.
Ans: The three types of rocks are metamorphic, sedimentary, and igneous.
(iv) How are extrusive and intrusive rocks formed?
Ans: Igneous rocks include both extrusive and intrusive types. Extrusive rocks are generated when molten magma from the earth's interior rises to the surface, cools, and solidifies on the crust. The structure of these rocks is incredibly fine grained. Take basalt, for example. Intrusive rocks develop when molten lava cools and solidifies deep within the earth's crust. They create big grains because they cool slowly. Granite is a good example of this rock.
(v) What do you mean by a rock cycle?
Ans: The rock cycle is defined as the transition of one type of rock into another under specified conditions and in a cyclic fashion. Igneous rocks, for example, which develop when molten lava solidifies, can break down into minute particles, which can subsequently be transported and deposited to produce sedimentary rocks. When heat and pressure are applied to sedimentary and igneous rocks, they convert into metamorphic rocks. These metamorphic rocks may break down to generate sedimentary rocks, or they may melt under extreme heat and pressure to form molten magma, which subsequently solidifies to become igneous rocks.
(vi) What are the uses of rocks?
Ans: The following are some uses of rock :
For the construction of roads, residences, and other structures.
For use in cutting and drilling.
Scientific inquiry is aided by the fossilised remnants of plants and animals found in rocks.
Minerals found in diverse rocks are utilised as fuels, medicines, fertilisers, and in a variety of industries.
(vii) What are metamorphic rocks?
Ans: Metamorphic rocks are the rocks that get formed under great pressure and heat.
Igneous and sedimentary rocks, when subjected to heat and pressure then get transformed into metamorphic rocks. For example, limestone into marble and clay changes to slate.
2. Tick the correct answer.
(i) The rock which is made up of molten magma is
(a) Igneous (b) Sedimentary (c) Metamorphic
Ans: (a) Igneous - Magma, a heated (600 to 1,300 °C, or 1,100 to 2,400 °F) molten or partially molten rock substance, solidifies to produce igneous rocks.
(ii) The innermost layer of the earth is
(a) Crust (b) Core (c) Mantle
Ans: (b) Core - The core refers to the earth's innermost layer. It is separated into two sections: the inner core and the outer core.
(iii) Gold, petroleum and coal are examples of
(a) Rocks (b) Minerals (c) Fossils
Ans: (b) Minerals - Fuel minerals, such as coal and petroleum, are classified as such. Carbonaceous fuels are what they're called. Fossil fuels are extracted from the earth and are created through the breakdown of fossils.
(iv) Rocks which contain fossils are
(a) Sedimentary rocks (b) Igneous rocks (c) Metamorphic rocks
Ans: (a) Sedimentary rocks - Fossil layers are sedimentary rock layers that include fossils. Sedimentary rock is a type of rock that forms in layers when sediments are deposited and pressed on top of one another.
(v) The thinnest layer of the earth is
(a) Crust (b) Mantle (c) Core
Ans: (a) Crust - In comparison to the other two layers, the crust is hard and very thin. The crust beneath the oceans is rather thin, extending only around 5 kilometres.
3. Match the following
Ans:
4. Give reasons.
(i) We cannot go to the centre of the earth.
Ans: Extremely high temperature and pressure characterise the earth's core, which is located around 6000 kilometres below the ocean's surface. At the earth's core, there is just molten magma. There is no oxygen. Any live entity would not be able to survive under such conditions. As a result, we are unable to travel to the Earth's core.
(ii) Sedimentary rocks are formed from sediments.
Ans: When large boulders break down into small fragments (or sediments), water and wind move the fragments and deposit them. Over time, the loose sediments compress and harden, forming layers of rocks. Sedimentary rocks are the name given to these types of rocks.
(iii) Limestone is changed into marble.
Ans: Sedimentary rocks, such as limestone. When it is subjected to tremendous heat and pressure, it transforms into marble, which is a metamorphic rock.
5. For fun
(i) What are the minerals most commonly used in the following objects?
Ans:
(ii) Identify some more objects made up of different minerals.
Ans: Graphite is used to make pencil lead. Copper wiring is used in telephones. Sulphur and chromite are found in our carpets. Quartz and Pentlandite are used to make clocks.
Topics Covered in Class 7 Geography Chapter 2 Inside Our Earth
Benefits of NCERT Solutions for Class 7 Geography Chapter 2 Inside Our Earth
The NCERT solutions provide a detailed explanation of the Earth's structure, helping students gain a thorough understanding.
The Class 7 Geography Chapter 2 questions and answers cover all the important topics and sub-topics of the chapter, providing students with a comprehensive understanding and facilitating effective revision.
Diagrams and illustrations included in the solutions enhance visual learning, making it easier for students to visualise and comprehend the Earth's internal processes.
These solutions inside our Earth Class 7 offer well-structured answers to textbook questions, which are beneficial for exam preparation.
The Geography Class 7 Chapter 2 solutions often include activities and interactive exercises that engage students, making the learning process more enjoyable and effective.
By explaining natural phenomena and their causes, the solutions help students connect textbook knowledge to real-world events, enhancing their overall learning experience.
Important Study MaterialLinks for Class 7 Geography Chapter 2 - Inside Our Earth
Conclusion
NCERT Solutions for Class 7 Social Science Chapter 2 Inside Our Earth, offers a comprehensive and detailed exploration of the Earth's structure. With the class 7 Social Science Geography Chapter 2, students can effectively revise the key concepts and topics covered in the chapter. These solutions effectively break down complex concepts such as the Earth's layers, types of rocks, and the rock cycle, making them accessible and understandable for students. The inclusion of diagrams and interactive exercises enhances learning and retention.
NCERT Solutions for Class 7 Geography - Other Chapter-wise Links for FREE PDF
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Download the FREE PDF of chapter-wise NCERT Solutions for Class 7 Civics through these links. These solutions offer detailed explanations, helping students understand key civic concepts and prepare for their exams.
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FAQs on NCERT Solutions For Class 7 Social Science Our Environment Chapter 2 Inside Our Earth - 2025-26
1. How should one describe the main layers of the Earth's interior for a Class 7 NCERT question?
To provide a correct answer as per the NCERT solutions for Class 7 Social Science Chapter 2, you should describe the Earth's interior in three main layers:
Crust: The thinnest, outermost layer. It is about 35 km thick on continental masses (composed of sial - silica and alumina) and only 5 km on ocean floors (composed of sima - silica and magnesium).
Mantle: Located just beneath the crust, extending up to a depth of 2900 km.
Core: The innermost layer with a radius of about 3500 km. It is made of nife (nickel and iron) and experiences extremely high temperature and pressure.
2. What is the correct way to classify the three major types of rocks as per NCERT Class 7 Geography Chapter 2?
According to the NCERT textbook, the three major types of rocks are classified based on their formation:
Igneous Rocks: Formed when molten magma cools and becomes solid. Examples include granite and basalt.
Sedimentary Rocks: Formed when small particles of rocks (sediments) are transported, deposited, and compressed over time. Examples include sandstone and limestone.
Metamorphic Rocks: Formed when igneous and sedimentary rocks are subjected to great heat and pressure, changing their form and character. Examples include slate (from clay) and marble (from limestone).
3. How can the rock cycle be explained step-by-step using the NCERT solution format?
The rock cycle is a continuous process where rocks transform from one type to another. A step-by-step explanation is as follows:
Molten magma from inside the Earth cools and solidifies to form igneous rocks.
These igneous rocks are broken down into small particles called sediments by processes like weathering and erosion.
These sediments are transported and deposited in layers. Over time, they are compressed and hardened to form sedimentary rocks.
When igneous and sedimentary rocks are subjected to intense heat and pressure, they change into metamorphic rocks.
Under extreme heat, metamorphic rocks can melt down again to form molten magma, and the cycle continues.
4. Why is the innermost layer of the Earth, the core, mostly made of nickel and iron (nife)?
The core is the innermost layer and experiences the highest pressure and temperature. It is primarily composed of heavy metals like nickel (ni) and iron (fe) because during the Earth's formation, heavier materials sank towards the centre due to gravity, while lighter materials rose to the surface to form the crust and mantle. This is why the core has such high density.
5. How does the formation of intrusive igneous rocks differ from extrusive igneous rocks, as explained in the NCERT solutions?
The key difference lies in where the molten magma cools:
Extrusive Igneous Rocks: Formed when molten lava comes onto the Earth's surface, cools down rapidly, and becomes solid. This rapid cooling results in very fine-grained structures. Basalt is a common example.
Intrusive Igneous Rocks: Formed when molten magma cools down slowly deep inside the Earth's crust. The slow cooling allows for the formation of large crystals. Granite is a typical example.
6. What is the scientific reason that only sedimentary rocks contain fossils?
Fossils are the preserved remains of ancient plants and animals. They are found almost exclusively in sedimentary rocks because these rocks are formed by the gradual accumulation and compression of sediments. This gentle process allows the remains of organisms to be buried and preserved. The immense heat and pressure that create igneous and metamorphic rocks would destroy any organic matter, preventing fossils from forming in them.
7. How do Vedantu's NCERT Solutions for Chapter 2 help in understanding the Earth's structure?
Vedantu's NCERT Solutions for Class 7 Geography Chapter 2 provide clear, step-by-step answers to all textbook questions. They break down complex concepts like the rock cycle and the layers of the Earth into easy-to-understand points. By following these solutions, students can learn the correct methodology to answer questions, understand key definitions, and grasp the core concepts required for their exams as per the 2025-26 CBSE syllabus.
8. What is the practical difference between a rock and a mineral, and why is this important for solving questions in Chapter 2?
The practical difference is based on composition and structure:
A mineral is a naturally occurring substance with a definite chemical composition and a specific crystal structure. For example, quartz.
A rock is an aggregate of one or more minerals and does not have a fixed chemical composition. For example, granite is a rock made up of minerals like quartz, feldspar, and mica.
Understanding this is crucial because questions in Chapter 2 often require identifying rocks based on their mineral content or explaining how minerals are the 'building blocks' of rocks.
9. Why can't we travel to the centre of the Earth, as discussed in the chapter?
As per Chapter 2, 'Inside Our Earth', travelling to the centre of the Earth is impossible. The core is located at a depth of over 6,000 km. To reach it, one would have to dig through the crust and mantle. The primary barriers are the extreme temperature and pressure, which increase dramatically with depth. The temperature at the centre is estimated to be as high as the surface of the sun, and the pressure is immense enough to crush any vehicle or human.
