I. Fill in the blanks:-
1. A material which is found in nature and is useful to human is called___________.
Ans : Resource.
2. Minerals once extracted cannot be____________.
Ans : Replaced.
3. _____________play a very important role in the economic development of a country.
Ans : Power minerals
4. Uranium is a __________ minerals.
Ans : Nuclear
5. ______________have ebormous potential to develop solar power.
Ans : Tropical regions
6. Resources are classified into __________ and __________ resources.
Ans : Potential and developed
7. On the basis of renewability resources are classified into ____________ and ____________ resources.
Ans : Renewable and non-renewable
8. Minerals are classified into __________ and _____________ minerals.
Ans : metallic and non-metallic
9. India’s largest offshore oil fuels is in Mumbai High.
Ans : Mumbai High.
II. Choose the correct answer:-
1. Resources already in use by humans are called
a) Developed b) Potential c) Flow resource
Ans : a) Developed
2. Minerals are resources.
a) Renewable b) Non – renewable c) Biotic
Ans : b) Non – renewable
3. A major user of wind energy in the world is
a) Europe b) South America c) Antarctica
Ans : a) Europe
4. Type of Coal mined our state is
a) Lignite b) Anthracite c) Graphite
Ans : a) Europe
5. The largest Hydro electric Power project of India is
a) Bakra nangal b) Mettur c) Damodar
Ans : a) Bakra nangal
6. Lignite is also called _____________.
a) Brown coal b) Black Coal c) Brown Coal
Ans : c) Brown Coal
7. In Tamil Nadu, Lignite is mined at ______________.
a) Neyveli b) Nilgiris c) Salem
Ans : a) Neyveli
8. In India major oil fields are found in ______________.
a) Orissa b) Assam c) West Bengal
Ans : b) Assam
9. The delta area in TamilNadu where petroleum is found is_____________.
a) Vaigai b) Cauvery c) South Pennar
Ans : b) Cauvery
10. The world’s largest producer of nuclear power is _____________.
a) UK b) USA c) Japan
III. Match the following:-
1. North Sea – a) Nuclear Power
2. Avalvaimozhi – b) Oil fields
3. Oil and coal – c) Yangtze
4. Three Gorges dam – d) Fossil fuel
5. Thorium – e) Wind farms
Ans : 1 – B, 2 – E, 3 – D, 4 – E, 5 – A
IV. Write brief answers:-
1. Define a) Non – renewable resources and b) Potential resources.
a) Non – renewable resources
i) Non – renewable resources are exhaustible resources because nature has a fixed stock of these resources.
ii) They are consumed faster than nature can replace them.
iii) Minerals are non-renewable resources because once they are extracted they cannot be replaced.
iv) Metallic minerals are examples of non-renewable resources.
b) Potential resources
i) Potential resources are those resources which have not yet been utilized by human.
ii) Resources of Siberia and Antarctica are examples potential resources.
2. Write about winds energy.
i) Wind energy is generated by using the wind to run turbines areas where there is constant flow of wind.
ii) Europe is a major user of wind energy.
iii) Twenty percent of Denmark’s electricity comes from wind power.
iv) In India Maharashtra and Tamil Nadu have developed wind Power.
v) In Tamil Nadu a large number of wind mills are found is Aralvaimozhi.
3. Why should we use resources wisely?
i) We should use non-renewable resources wisely because they cannot be replaced.
Nature has a fixed stock of these resources.
4. What are the three spheres that support the Biosphere?
They are Lithosphere or land the Hydrosphere or water and the atmosphere or the air that envelops the earth.
5. Mention the major oil fields of India.
i) In India Assam stands first in oil fields.
ii) Offstone oil fields are found in Mumbai High.
iii) In Tamil Nadu oil fields are found in the Cauvari basin.
6. Mention the places where nuclear power stations are located in India.
In India nuclear power stations are located at Madras, Rajasthan, kaiga, Tarapura, kakrapara and Narora.
V. Answer the following questions in detail:-
1. Explain the formation of Cool and Oil.
i) Coal is called a “fossil fuel” because it was “formed many million years ago.
ii) Large forests were buried in Sedimentary basins by geological processes.
iii) Over time the buried plant matter got converted into coal due to pressure and heat.
iv) Coal fields are found largely in USA, Russia, Germany and the U.K.
i) Oil is usually found in some strata of marine sedimentary rocks like mudstone, shale sandstone.
ii) The remains of Plants and Calcareous animals (Shelled animals) which buried in the earth were subjected to heat and Pressure.
iii) They changed into oil. This oil is found trapped in the pore spaces of the rocks.
2. Write an account of renewable resources.
i) Renewable resources are those which are infinite or are constantly renewed by nature.
ii) They continue to be available even after a part of it is consumed.
iii) Hydro – electric power, Solar power and wind energy are important renewable resources.
Hydro – Electric Power:
i) Hydro – electric power is the most developed source of renewable power.
ii) It is generated from falling water.
iii) Hydrological power is used extensively in many parts of the world where there are large rivers.
i) Solar energy is use to light homes, building and heat water.
ii) photovoltaic cells are required to stone the sun is energy.
iii) Germany is the world’s largest producer of Solar power.
iv) Tropical regions have anommous potential to develop solar power.
Wind energy :
i) Wind energy is generated by using the wind to run turbines in areas where there is constant flow of wind.
ii) Twenty percent of Denmark’s electricity comes from wind power.
iii) Europe is the major user of wind energy.