Samacheer Class 7 Social Science - Resources

China
2. Iron ores found at………………….in Tamil Nadu.
Kanjamalai
3. ………………..is produced from bauxite ore.
Aluminum
4. ……………… is used in making electrical batteries.
Manganese

5. Petroleum and its derivatives are called …………………..
Black gold

Solar
2. Hydroelectricity is generated from…………………water.
moving
3. ………………..resources that are once consumed and cannot be replaced.
Non – renewable
4. ………………..is the world’s number one country in the production of copper.
Chile

5. ………………..is a rare and precious metal.
Gold
6. …………….. field is one of the deepest mines of the world located in India.
Kolar Gold
7. ………………… is the world’s leading bauxite producer.
Australia
8. …………………is the world’s leading producer of manganese.
South Africa
9. …………………and…………………are the common ores of mica.
Muscovite and Biotite

10. ………………… is the world’s top producer of Mica.
China
11. Fossil fuels are formed from…………………
hydro carbon
12. ………………..in china is the largest hydroelectricity project in the world.
Three Gorges Dam
13. Tehri Dam is situated in ………………… in India.
Uttarakhand
14. The leading coal producers of the world is …………………
Arts:
China
15. ……………………..energy is not harmful to the environment
Solar

1. A. Iron
2. B. Mica
3. C. Wind energy
4. D. Sedimentary rock

1. Renewable resource
c) Wind energy
2. Metallic resource
a) Iron
3. Non-metallic resource
b) Mica
4. Fossil fuel
e) Petroleum
5.Limestone
d) Sedimentary rock

1. A. China
2. B. South Africa
3. C. Australia
4. D. Silver

1. Mexico
b) South Africa
2. Manganese
a) China
3. Bauxite
d) Silver
4. Mica
c) Australia

Iron is used to make steel.
It is usable in engineering applications such as the construction of machinery and machine tools, automobiles, large ships, structural components of buildings, bridges etc.

Duralumin is a strong, hard, lightweight alloy of aluminum widely used in aircraft construction.
It is produced by the addition of small quantities of other metals to aluminium, it creates a superior Alloy than pure aluminium.

Biotic resources:
Biotic resources are found in the biosphere which is obtained from living and organic materials.
Biotic resources depend on abiotic resources for their survival.
Example: Plants, trees, animals, microorganisms etc.
Abiotic resources :
Abiotic resources are the non-living parts of an environment.
Abiotic resources do not depend on biotic resources for their survival.
Example: Sunlight, temperature, water, soil, air, etc.

Renewable resources:
Renewable resources can be used again and again throughout its life.
These resources are present in unlimited quantity.
These resources are pollution-free
Example: Solar energy, wind energy, and hydropower.
Non-renewable resources:
Non-renewable resources cannot be used again and again as it is limited which can be depleted one day.
These resources are present in a limited quantity only.
These resources are not pollution-free.
Example: Fossil fuels, iron, copper, gold silver etc.

Metallic resources:
Metallic resources are the types of resources that are composed of metals.
These are hard substances, which are good conductors of heat and electricity.
Examples of metallic resources are iron, copper, gold, bauxite, silver, manganese, etc.
Non-metallic resources:
Non-metallic resources can be described as the resources that do not comprise of metals.
These are not hard substances and are not good conductors of heat and electricity.
Examples of non-metallic resources are mica, limestone, gypsum, dolomite, phosphate, etc.

Aluminium is light in weight, tough and cheaper, which makes it popular metal for constructional purpose.
It is mainly used in the construction of aircrafts, ship, automobiles, railway coaches and etc.
So, Aluminium has wide range of use compared to other metals.

At present, water is used for producing hydroelectric power. Hydroelectricity is generated from moving water with high velocity and great falls with the help of turbines and dynamos. So water is considered a great source of energy.

Wind Turbines do not produce any emissions. In react years, wind energy is one of the most economical and renewable energy technologies so wind power is clean energy.

Solar energy:
The sun produces energy in the form of heat and light. Solar energy is not harmful to the environment.
Photovoltaic devices or solar cells, directly convert solar energy into electricity.
India, China, Japan, Italy, and the States of America are major utilizers of solar energy in the world.
Hydropower:
Hydroelectricity power is the cheapest and most versatile source of energy out of all the know energy. Hydroelectric power is a renewable resource.
China, Canada, Brazil, the United States of America, Russia, India, Norway, and Japan are some countries producing hydroelectricity. China is the largest producer of hydroelectricity.
Wind energy :
Wind power is clean energy since wind turbines do not produce any emission.
In recent years, wind energy has become one of the most economical and renewable energy technologies.
Major wind energy-producing countries are United States, China, Germany, Spain, India, United Kingdom, Canada and Brazil.

Non-metallic resources:
Non-metallic resources can be described as the resources that do not comprise of metals.
These are not hard substances and are not good conductors of heat and electricity.
Examples of non-metallic resources are mica, limestone, gypsum, dolomite, phosphate, etc.
Mica:
Muscovite and Biotite are the common ores of Mica.
It is one of the indispensable minerals used in the electrical and electronics industry.
In powder form, it is used for making lubricating oils and decorative wallpapers.
Limestone:
Limestone is a sedimentary rock, composed mainly by skeletal fragments of marine organisms such as coral, foraminifera and molluscs.
About 10% of sedimentary rocks are limestones. Mostly limestone is made into crushed stone and used as a construction material.
It is used for facing stone, floor tiles, stair treads, windows sills, and many other purposes.
Crushed limestone is used in smelting and other metal refining process. Portland cement is made from limestone.

Fossil fuel resources:
Fossil fuel resources are normally formed from the remains of dead plants and animals.
They are often referred to as fossil fuels and are formed from hydrocarbon.
Coal:
This is the most abundantly found fossil fuel that forms when dead plant matter is converted into peat.
It is used as a domestic fuel, in industries such as iron and steel, steam engines to generate electricity.
Petroleum:
Petroleum is found between the layers of rocks and is drilled from oil fields located in Offshore and coastal areas.
Petroleum and its derivatives are called Black Gold as they are very valuable.
Natural gas:
Natural gas is found with petroleum deposits and is released when crude oil is brought to the surface.
It can be used as a domestic and industrial fuel.

China
4. Considered as a great source of energy.
Water
5. Precious metal like gold.
Silver
6. Used as an insulating material in the electrical industry.
Mica
Down
1. Used in making electrical batteries.
Manganese
2. Good conductor of heat and electricity.
Copper
3. The largest producer of gold in India.
Karnataka
5 . Produces energy in the form of heat and light.
Sun


7th Social Science Guide Resources Additional Important Questions and Answers