CBSE Class 8 Social Science Geography Revision Notes Chapter 3

Class 8 Geography Chapter 3 Notes

CBSE Class 8 Geography Chapter 3 Notes – Mineral and Power Resources

A mineral is a substance that occurs naturally and has a certain chemical composition. There are many different habitats and conditions which allow minerals to form. One or more elements mixed in different ratios make up minerals. Minerals are distributed unevenly throughout space. There are around three thousand types of minerals found in the earth’s crust. Some minerals are discovered in areas that are inaccessible to humans. A mineral can be identified by certain physical characteristics such as colour, density, and strength, as well as chemical properties.

Minerals are commonly found in various types of rocks. In general, metallic minerals can be found in igneous and metamorphic rocks. Non-metallic minerals are commonly found in plains and young folded mountains’ sedimentary rocks.

Minerals of various types are deposited in specific regions of the earth depending on various environmental conditions. Some of these minerals are utilised as power resources in industry, agriculture, transportation, communication, and defence areas.

Given below are some of the important concepts that students will learn from this chapter:

  • Human-made and natural resources, including the current state of these resources.
  • Types of resources.
  • The need for conservation of resources.
  • Human-made resources.

Chapter 3 of Class 8 Social Science is one of the most important chapters as most questions in the exam will come from it. Students can do well in their exams if they use Extramarks Revision Notes for Class 8 Social Science. The material is created with the assistance of subject matter experts according to the revised CBSE syllabus and guidelines. Extramarks offers clear, organised revision notes that help students quickly review the content of various chapters.

Mineral and Power Resources Class 8 Notes Geography Chapter 

Access Class 8 Social Science Chapter 3 – Mineral & Power Resources Notes

FAQs (Frequently Asked Questions)

1. Explain what is wind energy.

Wind energy is obtained from the speed of moving wind. This energy source is regarded as an endless or renewable source of power. Wind energy is produced when a windmill that is connected to a generator to produce electricity rotates in response to the speed of moving wind. Since the wind blows more quickly in open spaces, wind energy is typically found there. It is a pure and clean source of energy.

2. What is biogas?

Biogas is energy produced from organic materials such as dead plants, kitchen waste, cow dung, and other organic waste. These organic wastes are placed in large containers or pits known as biogas digesters, where bacteria decompose them. After a certain number of days, the digester emits biogas, a mixture of methane gas and carbon dioxide. Biogas is known as an effective cooking fuel as it generates a lot of heat and light. Although biogas is environmentally friendly, producing it is difficult and expensive.

3. Where are limestone and iron found in India?

Limestone: Chattisgarh, Jharkhand, Madhya Pradesh, Orissa, Tamil Nadu, and Gujarat.

Iron: It is found in the states of Maharashtra, Orissa, Goa, Chhattisgarh, Madhya Pradesh, Jharkhand,  and Karnataka.

4. What are the different ways of saving energy and resources at home?

The following steps can help save energy:

  1. Using solar panels to collect energy from the sun and use it to power various devices.
  2. Biogas can be used to cook food instead of LPG.
  3. People now use washing machines and dryers to clean their clothes. Instead of using a dryer, one can dry clothes outside in the sun.
  4. Switching off electric appliances when not in use.

5. One should carefully consider environmental factors before constructing large dams. Justify.

Human-made dams are detrimental to the ecosystem in many different ways. The dam must be built over a sizable area, which necessitates the removal of numerous trees from the surrounding forest. As a result, there are fewer trees, increasing environmental contamination. While building the dam, the balance of the earth’s surface is disturbed. Many people in the area will need to be replaced. Their lives become more challenging since they are transferred to new areas.

6. Why is petroleum referred to as “black gold”?

Petroleum is known as “black gold” because it is black in its crude form and its derivatives are as valuable as petroleum itself. We use petroleum products in our daily lives, such as nail polish, gasoline, candles, latex, and so on.

7. Why could quarrying become a major environmental concern?

Quarrying can be a major environmental concern for several reasons:

  • It has the potential to degrade soil humus, which is required for plant and crop growth.
  • The use of explosives to break up large chunks of rock can generate noise pollution.
  • A lot of dust is produced during the quarrying process, which causes air pollution as well as certain occupational hazards.
  • Large vibrations are generated during the quarrying process, causing damage to nearby buildings, dams, and other structures.