NCERT Solutions for Class 8 Social Science Geography Chapter 3
NCERT Solutions for Class 8 Social Science Geography Chapter 3 Mineral and Power Resources (खनिज और शक्ति संसाधन) to Study online in English Medium updated for new academic session 2020-21 following the new NCERT Books.
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Class: | 8 |
Subject: | Social Science – Geography |
Chapter 3: | Mineral and Power Resources |
Class 8 Geography Chapter 3 Question Answers
CBSE NCERT Solutions for Class 8 Social Science Geography Chapter Mineral and Power Resources is given below to download free in PDF form updated for new academic session 2020-21. Download these solutions for offline use or use as it is without downloading online.
8th Geography Chapter 3 Question Answers
What do yuu mean by Minerals?
Minerals:
A naturally occurring substance that has a definite chemical composition is a mineral. Minerals are not evenly distributed over space. Some minerals are found in areas which are not easily accessible such as the Arctic Ocean bed and Antarctica. Minerals are formed in different types of geological environments, under varying conditions. They can be identified on the basis of their physical properties such as colour, density, hardness and chemical property such as solubility. They are created by natural processes without any human interference.
What is open-cast mining?
The process of taking out minerals from rocks buried under the earth’s surface is called mining. Minerals that lie at shallow depths are taken out by removing the surface layer; this is known as open-cast mining.
What is shaft mining?
Deep bores, called shafts, have to be made to reach mineral deposits that lie at great depths. This is called shaft mining.
What do you understand by drilling during mining?
Petroleum and natural gas occur far below the earth’s surface. Deep wells are bored to take them out, this is called drilling.
What is quarrying?
Minerals that lie near the surface are simply dug out, by the process known as quarrying.
Important Notes on 8th Geography Chapter 3
Distribution of Mineral in India
1. Bauxite: Major bauxite producing areas are Jharkhand, Orissa, Chhattisgarh, Madhya Pradesh, Gujarat, Maharashtra and Tamil Nadu.
2. Iron: India has deposits of high grade iron ore. The mineral is found mainly in Jharkhand, Orissa, Chhattisgarh, Madhya Pradesh, Goa, Maharashtra and Karnataka.
3. Manganese: India’s manganese deposits lie in Maharashtra, Madhya Pradesh, Chhattisgarh, Orissa, Karnataka and Andhra Pradesh.
4. Limestone: Major limestone producing states in India are Bihar, Jharkhand, Orissa, Madhya Pradesh, Chhattisgarh, Rajasthan, Gujarat and Tamil Nadu.
5. Mica: Mica deposits mainly occur in Jharkhand, Bihar, Andhra Pradesh and Rajasthan. India is the largest producer and exporter of mica in the world.
6. Copper: It is mainly produced in Rajasthan, Madhya Pradesh, Jharkhand, Karnataka and Andhra Pradesh.
7. Gold: Kolar in Karnataka has deposits of gold in India. These mines are among the deepest in the world which makes mining of this ore a very expensive process.
8. Salt: It is obtained from seas, lakes and rocks. India is one of the world’s leading producers and exporters of salt.
Important Questions on 8th Geography Chapter 3
(a). Rural Areas: The biogas is one of the best sources of energy as per its availability and cost.
(b). Coastal Areas: Hydel and tidal energy.
(c). Arid Regions: Wind and solar energy as per speed of air and availability of sunlight.
Switch on the appliances (bulb, fans, AC, etc.) only on requirement.
Using led bulbs and tube which provides more light consuming less energy.
Use efficient cooking or heating devices.
Prevent leakage of electricity to save energy.
Switching off all electrical objects in an empty rooms.
It creates an imbalance in the Earth’s equilibrium leading earthquake threats.
Large area of vegetation submerged under the water.
Vegetation under the water decay under anaerobic condition realising greenhouse gases.
Flood threats loom large.
A huge population become displaced.