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NCERT Solutions for Class 8 Social Science Geography Chapter 3 - Mineral and Power Resources

Explore the NCERT Solutions for Class 8 Social Science Chapter 3 - Mineral and Power Resources, a crucial component of the academic curriculum. This chapter delves into the study of natural resources and their systematic categorization. Students gain valuable insights into the significance of minerals and power resources in the contemporary global context. Enhance your understanding of the topics by accessing the free PDF download of NCERT solutions specifically tailored for this chapter.

Access Answers to NCERT Solutions for Class 8 Social Science Geography Chapter 3 - Mineral and Power Resources

Mineral and Power Resources

Question 1 :

Answer the following questions.

i. Name any three common minerals used by you every day. 

ii. What is an ore? Where are the ores of metallic minerals generally located?

iii. Name two regions rich in natural gas resources.

iv. Which sources of energy would you suggest for

    (a) rural areas (b) coastal areas (c) Arid regions.

v. Give five ways in which you can save energy at home. 

 

Answer :

i. Gold, Silver and Copper are three common minerals used by us every day.

ii. Ores are nothing but rocks which are high in mineral content. A particular type of ore is called as such only if the mineral from it can be extracted profitably.

iii. Russia and Norway are the two regions rich in natural gas resources.

iv.  We would suggest Biogas energy for Rural areas, Hydel and Tidal energy for coastal areas and Wind  and Solar energy for arid regions

v. Five ways in which we can save energy at home are:

  1. By Switching off the lights, fans and other electrical appliances when not in use.

  2. By making sure that the devices are operating efficiently.

  3. By using energy-efficient devices such as fluorescent bulbs and LEDs.

  4. By using energy efficiently while cooking.

  5. By unplugging electrical devices when not in use to prevent the leakage of energy.


Question 2 :

Tick the correct answer.

i. Which one of the following is NOT a characteristic of minerals?

  1. They are created by natural processes.

  2. They have a definite chemical composition.

  3. They are inexhaustible.

  4. Their distribution is uneven.

ii. Which one of the following is NOT a producer of mica?

  1. Jharkhand 

  2. Karnataka

  3. Rajasthan

  4. Andhra Pradesh

iii. Which one of the following is a leading producer of copper in the world?

  1. Bolivia

  2. Ghana

  3. Chile

  4. Zimbabwe

iv. Which one of the following practices will NOT conserve LPG in your kitchen?

  1. Soaking the dal for some time before cooking it.

  2. Cooking food in a pressure cooker.

  3. Keeping the vegetables chopped before lighting the gas for cooking.

  4. Cooking food in an open pan kept on low flame.

 

Answer :

i. (c) They are inexhaustible.

 

ii.  (b) Karnataka

 

iii. (c) Chile

 

iv. (d) Cooking food in an open pan kept on low flame.

 


Question 3 :

Give reasons.

i. Environmental aspects must be carefully looked into before building huge dams.

ii. Most industries are concentrated around coal mines.

iii. Petroleum is referred to as “black gold”.

iv. Quarrying can become a major environmental concern.

 

Answer :

i. Environmental aspects must be carefully looked into before building huge dams due to the following reasons:

  • Dams can create imbalance in the earth’s equilibrium if they are quite large.

  • Deforestation may lead to environmental pollution.

  • People have been displaced to build dams.

  • Settlements require shifting causing loss of jobs and livelihood for the people.

  • Flood threats are always there near the dams.

  • Earthquake threats also remain there around dams.

  • Silting of lakes affects the fertility of soil.

ii. Coal can be used as a source of energy and power and also as a raw material in most of the industries. Hence most industries are concentrated around coal mines to save the cost of transportation of coal from the mines to the industries.

iii. Petroleum is referred to as “black gold” because it is black in colour in the crude form and its derivatives are extremely valuable as petroleum itself. We use petroleum products in our day to day life such as nail paint, petrol, candle, latex, etc.

iv. Quarrying can become a major environmental concern due to the following reasons:

  • It can destroy the humus of soil which is needed for the growth of plants and crops.

  • It can produce a lot of noise pollution due to the use of explosives in order to break the huge chunks of rocks.

  • In the process of quarrying, a lot of dust is generated which causes air pollution and also certain occupational hazards.

  • Blasts done in the process of quarrying generate large vibrations which damage nearby buildings, dams or any other similar structure.

 


Question 4 :

Distinguish between the following.

i. Conventional and Non-conventional sources of energy

 

ii. Biogas and natural gas

 

iii. Ferrous and Non-ferrous minerals 

 

iv. Metallic and Non-metallic minerals

 

Answer :

i. The difference between the conventional and non-conventional sources of energy are:

S. No.

Conventional Sources of Energy

Non-Conventional Sources of Energy

1.

They are non-renewable sources of energy.

They are renewable sources of energy.

2.

They cause pollution to a large extent.

They cause no pollution at all.

3.

They are coal, petroleum, etc.

They are wind power, hydroelectric power, etc.

ii. The difference between biogas and natural gas are:

S. No.

Biogas

Natural Gas

1.

It is formed due to decay of organic matter in biogas plants.

It is formed below the earth’s surface and comes out with crude oil.

2.

It causes pollution to a large extent.

It causes lesser pollution.

3.

It is cheaper.

It is relatively expensive.

4.

It is used for domestic purposes.

It is used for all purposes.

iii. The difference between ferrous and non-ferrous minerals are:

S. No.

Ferrous Minerals

Non-Ferrous Minerals

1.

They contain iron.

They do not contain iron.

2.

They are cheaper to extract.

They are expensive to extract.

3.

They have a large industrial use.

They have lesser industrial use.

iv. The difference between metallic and non-metallic minerals are:

S. No.

Metallic Minerals

Non-Metallic Minerals

1.

It contains metals.

It contains compounds of metals which are hard to extract

2.

It gives iron, aluminium, copper, etc.

It gives gypsum, limestone, etc.

 

 


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