Mineral and Power Resources | Chapter 3 | Geography 8th |
Chapter 3 – Mineral and Power Resources
Exercises
Free Download | Geography | Class 8th | eBook |
Q1. Answer the following
questions.
(i) Name any three common minerals used by you every
day.
Ans. Three common minerals used every day:
(ii) What is an ore? Where are the ores of metallic
minerals generally located?
Ans. Ores are the rocks from which minerals are mined. The ores of
metallic minerals are generally found in igneous and metamorphic rock
formations that form large plateaus.
(iii) Name two regions rich in natural gas
resources.
Ans. Russia and the United Kingdom are the two regions rich in
natural gas resources.
Ans.
(v)
Give five ways in which you can save energy at home.
Q2. 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.
(ii) Which
one of the following is a leading producer of copper in the world?
(a) Bolivia
(c) Chile
(b) Ghana
(d) Zimbabwe
(iii) Which
one of the following practices will NOT conserve LPG in your
kitchen.
(a) Soaking
the dal for some time before cooking it.
(b) Cooking
food in a pressure cooker.
(c) Keeping
the vegetables chopped before lighting the gas for cooking.
(d) Cooking
food in an open pan kept on low flame.
Ans.
(i). Which one of the following
is not a characteristic of minerals?
Ans.
(c) They are inexhaustible
(ii). Which one of the following
is not a producer of mica?
Ans.
(b) Karnataka
(iii). Which one of the
following is the leading producer of copper in the world?
Ans.
(c) Chile
(iv). Which one of the following
practices will not conserve LPG in your kitchen?
Ans.
(d) Cooking food in an open pan kept on low flame.
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Q3. Give reasons – Why?
(i) Environmental aspects must be carefully looked
into before building huge dams;
Ans. Dams help in creating hydroelectric power, which solves the
energy problems of a region. They also help farmers as the water released from
dams is used for irrigation. However, dams have a negative impact on the
environment as well. They adversely affect the surrounding ecosystems by
destroying the local flora and fauna, by displacing the local community, by
changing the natural course of rivers, etc. Therefore, before a dam is built at
a site, it should be ascertained whether its benefits justify the damages that
it would inevitably cause to the various ecosystems. If they do justify, then
steps should be taken to minimize the damages to the flora and fauna, and to
relocate the local community. But if they don’t, then environmental
conservation should be given priority over the building of the dam.
(ii) Most industries are concentrated around coal mines.
Ans. Coal is the most abundant fossil fuel. It is widely used as a
source of energy. It is also used as a raw material in several industries. Most
industries are located around coal mines as being situated close to coal mines
proves to be cost-effective. Coal can easily be transported from the mines to
the industries, and this reduces both time and cost of transportation.
(iii)
Petroleum is referred to as “black gold”?
Ans.
The term “black gold” is used with reference to petroleum and its various
derivatives. The word ‘black’ refers to the colour of petroleum in its crude
form. The word ‘gold’ implies that petroleum and all the various products of
petroleum (like diesel, petrol, kerosene, wax, plastics, and lubricants) are as
valuable to human society as the metal gold.
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(iv) Quarrying can become a major environmental
concern.
Ans. Quarrying is an extraction process by which minerals lying near
the Earth’s surface is the dugout. This process can adversely affect the environment in different ways. The digging involves clearing of vegetation.
This destroys the topsoil, which contains the humus required for plant growth.
The quarrying process involves the use of explosives and earth-moving
equipment. These cause noise pollution, and may also damage nearby buildings, dams,
or other such structures. The dust generated during quarrying and the fossil
fuels burnt while operating the equipment contribute to air pollution, which in
turn affects the health of the miners and the local population.
Q4. Distinguish between the following:
(i)
Conventional and non-conventional sources of energy
(ii) Biogas
and natural gas
(iii)
Ferrous and nonferrous minerals
(iv)
Metallic and non-metallic minerals
Ans.
(i)
Conventional and non-conventional sources of energy:
Conventional |
Non-conventional |
(i)
Have been in common use for a long time. |
(i).
Are not commonly used. |
(ii)
Are generally exhaustible. |
(ii)
Are generally inexhaustible. |
(iii)
Are mostly polluting. |
(iii)
Are mostly non-polluting. |
(iv)
Example; Firewood, coal |
(iv)
Example; Solar energy, nuclear energy. |
(ii)
Biogas and natural gas:
Biogas |
Natural Gas |
i.
Found using organic wastes, such as dead plants and animal matter, etc. |
i.
Found along with petroleum deposits and gets released when crude is brought to the surface. |
ii. It is a non-conventional source of energy. |
ii. It is a convenient source of energy. |
iii. It is easily available, especially in rural areas. |
iii. It is not easily available, very few countries have natural gas reserves. |
iv.
Is polluting, causes the greenhouse effect by releasing carbon dioxide. |
iv. It is a cleaner fuel. |
v.
Used as a domestic fuel as cooking and lighting. |
v.
Used as domestic fuel and industrial fuel. |
Ans.
(iii)
Ferrous and non-ferrous minerals:
Ferrous |
Non-ferrous |
i.
A metallic mineral that contains iron. |
i.
A metallic mineral that does not contains iron. |
ii.
Example: Iron ore, manganese. |
ii.
Example: Gold, silver. |
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Ans.
(iv)
Metallic and non-metallic minerals:
Metallic |
Non-metallic |
i.
A mineral containing metal in raw form. |
i.
A mineral not containing metal. |
ii.
Example: Bauxite, iron ore. |
ii.
Example: Limestone, gypsum. |
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