Mineral and Power Resources Class 8 Notes Geography Chapter 3 - PDF Download
A mineral is a naturally occurring substance having a definite chemical composition. Minerals are formed by natural processes and do not require any human interference. Minerals are generally formed in various environments and under different conditions. Minerals can be made of one element or more than one element combined in different proportions. Minerals are unevenly distributed throughout the space. Some minerals are found in areas that are not easily accessible to humans. A mineral can be identified by its physical characteristics such as colour, density, and strength, and they can also be identified by chemical properties.
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Class 8 Social Science Geography Chapter 3 Mineral And Power Notes
Types of Minerals
There are many minerals that are found in nature, and to date, and 3,000 different kinds of minerals have been identified from the earth’s crust. These minerals are different from each other based on their composition. Basically, minerals are divided into two categories, i.e. Metallic and Non-metallic.
Metallic minerals are those minerals that are formed by the reaction of metals and other elements. The metallic minerals represent the properties of metals. They exhibit characteristics such as shining and lustrous. They are good conductors of heat and electricity. Based on their chemical properties, minerals can be oxides, sulphides, and carbonates.
Non-metallic minerals are those minerals that do not contain any type of metal. Even if we cannot extract metals from these minerals yet, they are of great importance to us. Petroleum, coal are examples of Non-metallic Minerals.
Uses of Minerals
Minerals are essential in our day-to-day activities. Here we have listed down the various uses of minerals.
Metallic minerals such as copper are good conductors of electricity and are thus used in electrical equipment.
Minerals are also required by our body, such as calcium for healthy teeth and bones.
Minerals like aluminium are used for packing food products etc.
Hence, it can be said that minerals are of great use to humanity.
What are Power Resources?
By power resources, we simply mean the energy or power that is used to run industries, agriculture, transport, communication, and defence. Power resources are required in all fields and play a very vital role in our lives.
Power resources can be of two types: Conventional Resources and Non-conventional Resources.
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Conventional resources or conventional sources of energy include oil, natural gas, coal, etc. These are generally formed in nature and are non-renewable. This means that once these resources are exhausted, they may take millions of years to be formed again. Coal, petroleum, firewood, and natural gas are all examples of conventional sources of energy.
Non-Conventional resources are those energy resources that are abundantly found in nature. These energy resources are also called renewable sources of energy because they can be replenished. These sources of energy are considered as clean and pure sources of energy. This energy is environment friendly. They are emerging as the most used energy resources because of the scarcity of conventional resources. Non-conventional energy resources include wind energy, solar energy, tidal energy, geothermal energy, and Biogas.
Class 8 Geography Chapter 3
The Class 8 Geography Chapter 3 briefs the students on all about mineral and power resources. The Mineral and Power Resources Class 8 act as an essential guide for the students to understand the chapter easily. The chapter provides detailed information about types of minerals and power resources and extraction of minerals. The Minerals and Power Resources Class 8 provides an overview of the chapter through various solved exercise questions. These-provide all the questions and answers of the chapter that helps the students to gain a brief knowledge of the chapter.
FAQs (Frequently Asked Questions)
1. What do you mean by wind energy?
Wind energy is the energy that is obtained by the speed of moving wind. This source of energy is considered as an inexhaustible or renewable source of energy. Wind energy is obtained when the speed of moving wind rotates the windmill which is connected to a generator that converts the wind energy to electricity. Wind energy can be generally found in open spaces as the wind blows at high speed in these areas. Wind energy is a clean and pure form of energy.
2. What is biogas?
Biogas is the energy that is obtained from organic materials like dead plants, kitchen waste, cow dung, and other organic materials. These organic wastes are put in large containers or pits called biogas digesters and are decomposed by bacterial action. After certain days, The digester emits biogas which is a mixture of methane gas and carbon dioxide. Biogas is considered as an excellent fuel used for cooking. It produces a high amount of heat and light. Biogas is eco-friendly in nature, but producing this energy is challenging as well as costly.