NCERT Solutions for Class 7 Social Science Chapter 2 Inside Our Earth- Free PDF Download
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.
Important Topics Covered in the NCERT Solutions Class 7 Social Science Our Environment Chapter 2
The important topics that are covered in Chapter 1 of NCERT Solutions for Class 7 Geography are as follows.
Components of the Environment
Natural Environment
Human-made Environment
Atmosphere
Ecosystem
What Will You Learn in Class 7th Geography Chapter 2?
What is the Environment?
The environment is everything which surrounds us, which can either be living or nonliving things. It includes physical, chemical and other natural forces. Natural Environment contains water, air, land, plants and animals. Human beings commune with the environment and adjust it according to their needs.
Which are the Significant Components of the Environment?
Components of the environment are:
Natural components
Human-made components
Human components
Ecosystem
The ecosystem is a system formed by the communication of all human beings or all living organisms with each other and with the physical and chemical factors of the Environment in which they live; all depends on the transfer of material and energy.
Ecology and Environmental Science are the subdivision of Life Sciences, which mainly deals with the study of organisms and their interactions among organisms and their environment.
Types of Ecosystem
There are two main types of ecosystem. The types and examples of the ecosystem are listed below:
Natural Ecosystem – Natural ecosystem is a naturally produced biological environment found in nature. It appends deserts, forests, grasslands, lakes, mountains, ponds, rivers, oceans, etc.
Artificial Ecosystem – Artificial ecosystem is an artificial environment which is created and maintained by Man. It includes crop fields, gardens, aquariums, parks, zoos, etc.
Components of the Environment
Environment mainly comprises the atmosphere, hydrosphere, lithosphere and biosphere. But it can be classified into two types such as (a) Microenvironment and (b) Macro Environment. It can also be classified into two other types such as (c) Physical and (d) Biotic Environment.
The microenvironment defines the instant local surrounding of the organism.
The macro-environment can be defined as all the physical and biotic conditions that surround the organism externally.
The physical environment defines all abiotic conditions or factors like temperature, light, rainfall, soil, minerals etc. It comprises the atmosphere, lithosphere and hydrosphere.
The biotic environment involves all biotic factors or living forms like plants, animals, and microorganisms.
Important Points to Remember
Plants, animals, and humans all rely on their immediate environment. They are also dependent on one another. An ecosystem is made up of the interactions between living things as well as the interactions between living things and their surroundings.
Land, water, air, plants, and animals make up the natural environment. As a result, the natural environment encompasses both biotic and abiotic factors.
Buildings, parks, bridges, and highways are four examples of man-made components.
The lithosphere is the earth's solid crust or hard top layer. It's made primarily of rocks and minerals. Mountains, plateaus, plains, valleys, and other landforms make up irregular surface.
Biotic factors comprise two key components: plants and animals. The biosphere is a limited zone of the earth where land, water, and air interact to support life. Thus, the plant and animal kingdoms combine to form the biosphere.
Why Should Students Study Vedantu’s Social Science Geography Chapter 2 NCERT Solutions?
Our Environment textbook solutions of Social Science are designed with the focus on providing students with the knowledge of the environment we live in.
It also describes in detail the various components of the environment, which include the 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. Our Environment is an integral part of the syllabus for Class 7 students as it will let them know the various aspects of nature. Our life mostly depends on our surroundings, and Social Studies throw light on how we sustain in the Environment.
How Do the NCERT Solutions by the Experts of Vedantu Help?
For securing a good score, Vedantu’s expert teachers provide a fair idea of the chapter through their NCERT Solution for Class 7th Geography Chapter 2 that how students should write the answers and how they should explain the key points, etc. Experienced teachers who are familiar with the CBSE syllabus and question paper model understand what helps fetch good marks in CBSE exams.
They design the PDF for NCERT Solutions for Class 7th Geography Chapter 2 in such a way that it also helps address those key details in the chapter that other solution guides may have missed or overlooked as unimportant.
Solved Example
Question: Which rocks from the following contain fossils:
a) The sedimentary rocks
b) Metamorphic rocks
c) Igneous rocks
Solution: (a)
Chapter-wise NCERT Solutions for Class 7 Social Science (Geography) - Our Environment
Vedantu offers NCERT Answers for Class 7 Geography Chapter 2. The simplified and simple NCERT Answers not only clarify every student's doubt in a theoretical and experimental manner, but also teach them the most effortless and to-the-point responding approaches to earn high marks. Students must refer to NCERT Book Solutions for Class 7 SST Geography Chapter 2 Within Our Planet for a thorough understanding of the subject or lesson.
So, download the free PDF now!
Conclusion
NCERT Solutions for Class 7 Social Science Chapter 2 explain plate tectonics, Earth's lithospheric plate movements, and their impact on geological events like earthquakes, volcanoes, and mountains. It also covers minerals, rocks, and their industrial applications, as well as fossils for understanding Earth's history and life evolution. The organized format of the solutions allows self-paced studying, aiding exam preparation and homework. This chapter enhances students' critical thinking, analytical skills, and knowledge of Earth's structure, vital for comprehending natural phenomena, environmental changes, and our planet's history.
FAQs on NCERT Solutions for Class 7 Social Chapter 2 - Inside Our Earth
1. What is the necessity of the environment, and what are the impacts of human activities on it?
The environment is critical to healthy living and the survival of life on our planet, Earth. Earth is home to various living creatures, and we are all dependent on the environment for food, air, water, and so on. Food is a basic requirement for everyone. Air keeps all living things alive. Water covers the majority of the earth's surface. As a result, everyone must conserve and safeguard the environment. There are several forms of human activity that might be directly linked to environmental disasters. Disasters include acid rain, ocean acidification, climate change, deforestation, ozone layer depletion, hazardous waste disposal, global warming, overpopulation, pollution, and so on.
2. Why should you conserve biodiversity?
It is believed that an area with higher species abundance has a more stable environment compared to an area with lower species abundance. Additionally, there is a necessity for biodiversity considering our dependency degree on the environment.
We depend directly on many species of plants for several needs. Similarly, we depend on several species of animals and microbes for various reasons. Biodiversity is being lost due to the over-exploitation of resources, loss of habitat, climatic changes, invasive exotic species, diseases, pollution, hunting, etc. Since it provides us with several economic and behavioural benefits and adds aesthetic value, it is crucial to conserve biodiversity.
3. What makes up the interior of the Earth according to Chapter 2 of Our Environment Textbook of Class 7?
The interior of the earth is divided into three parts. The crust is generally made of multiple varieties of rocks (sedimentary, igneous, and metamorphic). The crust is the outermost layer that extends to the interior. The mantle lies beneath this crust which is characterized by dense, hot, and bulky solids. This layer is the most predominant in terms of volume. Underneath this, we would find the core.
4. What is the meaning of inside our Earth according to Chapter 2 of Our Environment Textbook of Class 7?
Inside of our earth refers to the interior portion or region of the earth which lies beneath the earth’s outermost surface or beneath the earth’s crust. This interior region is made up of the mantle and the core. The core is further subdivided into the outer core and inner core. The mantle is the most predominant layer in terms of occupying the earth’s total volume.
5. What do you mean by rocks and minerals according to Chapter 2 of Our Environment Textbook of Class 7?
Some rocks are made up of extinct animal shells or crushed plant pieces. Minerals are naturally occurring inorganic elements or compounds with a well-ordered internal structure, chemical composition, crystal form, and physical properties. All of them are like the building pieces of our planet, and their qualities must be examined in order to have a thorough understanding of their origin, processes, and so on. If you have any further questions about this issue, please visit the Vedantu website. The Vedantu Mobile app is also available.
6. What is a globe, according to Chapter 2 of Our Environment Textbook of Class 7?
Globe is nothing but a scaled-down model of our earth. The globe is spherical, whereas our earth is orange in shape. This shape is known as a geoid. There are different types of globes. They are broadly divided into two types, namely the terrestrial globe and the celestial globe. The terrestrial globe has the world’s maps and the celestial globe is used to map stars.
7. How do I download the Solutions for Chapter 2 of Class 7 Our environment Textbook?
The solutions are easily available on the Vedantu site.
Click on NCERT Solutions for Class 7 Textbook Our Environment.
Choose Chapter 2.
The webpage with Vedantu’s solutions for Class 7 SST Our environment Chapter 2 will open.
To download this, click on the Download PDF button and you can view the solutions offline.
The solutions of the other Social Science books and chapters can also be found on the Vedantu site and that too without any cost.