NCERT Book Solutions Class 8 Resource And Development Chapter 3
What are minerals? A naturally occurring substance with a definite chemical composition is called a mineral. Minerals are not evenly distributed over space, but are concentrated in a particular area or rock formations. Did you know that the salt in your food and graphite in your pencil are also minerals? Students can explore further about the various types of minerals and power resources from Chapter 3 of NCERT Class 8 Geography book. NCERT Solutions for Class 8 Geography Chapter 3 Mineral and Power Resources contain solutions to the exercises given in the Geography book-Resources and Development. These NCERT Solutions of the exercises provided by BYJU’s help students to prepare for the exams.
Students can download the NCERT Solutions for Class 8 Geography PDF below.
NCERT Solutions for Class 8 Geography (Resources and Development) Chapter 3 Mineral and Power Resources:- Download PDF here
NCERT Solutions for Class 8 Geography Chapter 3 – Mineral and Power Resources
1. Answer the following questions.
(i) Name any three common minerals used by you every day?
Answer: Salt, petroleum and gold are the common minerals that are used by humans on a regular basis.
(ii) What is an ore? Where are the ores of metallic minerals generally located?
Answer: Ores are the rocks which are mined to extract minerals from them. Minerals occur in different types of rocks. Some are found in igneous rocks, some in metamorphic rocks, while others occur in sedimentary rocks. The ores of metallic minerals are found in igneous and metamorphic rock formations that form large plateaus.
(iii) Name two regions rich in natural gas resources?
Answer: The United Kingdom and the Netherlands are the major producers of natural gas. Natural gas is found with petroleum deposits and is released when crude oil is brought to the surface. It is used as a domestic and industrial fuel.
(iv) Which sources of energy would you suggest for (a) rural areas (b) coastal areas (c) Arid regions?
(a) In rural areas – coal, solar energy, bio-gas and firewood can be used as sources of energy.
(b) In Coastal areas – wind power, petroleum and tidal power can be used.
(C) In arid areas, geothermal powers and solar energy are the most suitable sources of energy to be used.
(v) Give five ways in which you can save energy at home.
- Switching off the lights, TV and electric fans, when they are not in use.
- Closing the tap properly, so that it does not drip
- Using pressure cooker for cooking
- Walking or using bicycles for short distance commutes.
- Minimizing the use of refrigerators, air conditioners and lifts.
2. Tick the correct answer.
(i) Which one of the following is NOT a characteristic of minerals?
(a) They are created by natural processes.
(b) They have a definite chemical composition.
(c) They are inexhaustible.
(d) Their distribution is uneven.
Answer: (c) They are inexhaustible
(ii) Which one of the following is a leading producer of copper in the world?
Answer: (d) Chile
(iii) Which one of the following practices will NOT conserve LPG in your kitchen.
(a) Cooking food in an open pan, kept on low flame.
(b) Soaking the dal for some time before cooking it.
(c) Cooking food in a pressure cooker.
(d) Keeping the vegetables chopped before lighting the gas for cooking.
Answer: (a) Cooking food in an open pan, kept on low flame
3. Give reasons.
(i) Environmental aspects must be carefully looked into before building huge dams.
Answer: Construction of a huge dam creates large scale destruction of natural vegetation and wildlife in those areas, which get submerged. This is not good for the ecosystem. Hence, environmental aspects must be carefully looked into, before building huge dams.
(ii) Most industries are concentrated around coal mines.
Answer: Coal is an important source of energy and hence most of the industries are located around coal mines.
(iii) Petroleum is referred to as “black gold”.
Answer: Petroleum is a thick black liquid and is a valuable resource for various industries. Hence, it is also known as “Black Gold”.
(iv) Quarrying can become a major environmental concern.
Answer: Quarrying creates many problems. Fine dust particles spreads in the air around a quarrying site. Dust particles from quarry can cause respiratory problems. Quarrying also destroys natural vegetation and thus the home of many wild animals.
4. Distinguish between the following.
(i) Conventional and non conventional sources of energy
Answer: Conventional sources of energy are those which have been in common use for a long time. Firewood and fossil fuels are the two main conventional energy sources. Whereas, Non-Conventional sources of energy are alternative forms of energy used in the modern times. The use of renewable energy sources like organic waste, tide and wind energy come under non-conventional energy sources.
(ii) Biogas and natural gas
Answer: The gaseous fuel formed from the conversion of organic waste such as dead plant, animal material, animal dung and kitchen waste is called biogas. Biogas is a mixture of methane and carbon dioxide and produces a huge amount of organic manure each year. Whereas, Natural gas is extracted with petroleum deposits when crude oil is brought to the surface.
(iii) Ferrous and nonferrous minerals
Answer: Ferrous minerals contain iron such as iron ore, manganese and chromites. On the other hand, non-ferrous minerals do not contain iron like gold, silver, copper or lead.
(iv) Metallic and nonmetallic minerals
Answer: Metallic minerals contain metal in raw form. Bauxite and manganese are some examples of metallic minerals. While metals such as Limestone, mica and gypsum do not contain minerals and are called as Non-metallic minerals.
Chapter Mineral And Power Resources Summary
Minerals are naturally occurring substances that have a definite chemical compositions. They are formed in different types of geological environments, under varying conditions. Minerals are non-renewable resources. Minerals can be identified on the basis of their physical properties such as colour, density, hardness and chemical properties such as solubility.
Types of Minerals: On the basis of composition, minerals are classified into metallic and non-metallic types.
Metallic minerals contain metals in raw form. Metallic minerals are of two types: (a) Ferrous and (b) Non-ferrous.
Non-metallic minerals do not contain metals. For example, limestone, mica, gypsum, coal, and petroleum.
You will also learn about the following:
- Metals, ferrous and Non-ferrous Metallic Minerals
- Methods of extraction of Minerals such as Mining, drilling, and quarrying
- Industrial development
- Distribution of Minerals, types of rocks
- Uses of Minerals, Distribution of Minerals in India and conservation of minerals
- Power resources
- Power resources are of two types: Conventional Resources and Non-conventional Resources
- The energy resources that have been in common use for a long time are known as conventional sources like Firewood and fossil fuels.
- Non-conventional sources of energy are renewable in nature such as Solar energy, wind energy and tidal energy. Non-conventional sources of energy are more expensive, as they require technological upgrades. India has a great potential for Solar energy.
Resources and Development is an important book for Class 8 Social Sciences subject. Apart from this chapter, the full set of NCERT Solutions for Class 8 Social Science is given in the linked article.