Natural Resources

For Class 4

A. ANSWER THESE QUESTIONS.

1. What is a natural resource? Give two example.
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   Resources which are formed by themselves in nature and which can be used by us for economic gain are called natural resources. For example, sunlight and water.
2. What is the difference between renewable energy and non-renewable energy sources?
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   Renewable energy sources are energy that last forever and can be used again and again. For example, solar energy, wind energy, tidal energy, etc.
   Non-renewable energy sources are energy that don’t last forever and once used up, we will not get these resources. For example, coal, petroleum, natural gases, etc.
3. How do we use river water?
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   Rivers are used to supply water to our towns and cities, to irrigate our crops, to fish, to transport people and goods, etc.
4. How does cutting down trees affect soil?
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   The roots of trees hold the soil and do not let it get blown away by the wind or washed away by water. If we cut down many trees in an area it will cause soil erosion.
5. Name four minerals.
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   Iron, gold, diamond and ruby.
6. How was petroleum formed? Name three fuels we get from petroleum.
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   Petroleum are formed from the remains of dead plants and animals that got buried millions of years ago. We get petrol, diesel and kerosene from petroleum.
7. Why is coal not a mineral?
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   Coals are formed from the remains of dead plants and animals that got buried millions of years ago but minerals are naturally occurring solid that does not usually come from plants or animals. That is why coal is not a mineral.
8. What is an ore? Give example of two ores.
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   Ore is a mineral from which we get a metal. For example, Bauxite and Galena are ores of Aluminium and Lead.
   
9. Why dams are built? Name two Indian dams.
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   Dams are built to store water behind them, to control floods and to generate electricity from water. For example, Bhakra dam on river Satluj and Hirakud dam on river Mahanadi.
10. What are minerals? Give two examples of minerals.
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    Minerals are naturally occurring solid that does not usually come from plants or animals. For example, iron and gold.

B. WRITE TRUE OR FALSE.

1. Trees are renewable resource.
2. Coal and petroleum are renewable resources.
3. Black soil is good for growing cotton.
4. Air cannot help us generate electricity.
5. The remains of plants and animals can turn into resources.

C. FILL IN THE BLANKS.

1. If used carefully, fresh water and trees are ___________ resources.
2. The soil found in the northern plains is _________ soil.
3. A river’s water can be stored by building a __________ across it.
4. The ________ and the _________ are snow-fed rivers of India.
5. The _________ is a mineral-rich region of India.