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प्रश्न
State the main difference between the renewable and non-renewable sources of energy.
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उत्तर
Renewable sources:
- These are the sources from which energy can be obtained continuously over a long period of time.
- They are non-conventional sources.
- These are the natural sources that will never get exhausted.
- These sources can be regenerated.
- Examples: Solar energy, wind energy, hydro-energy, geothermal energy, and nuclear energy.
Non-renewable sources:
- These are the sources from which energy can not be continuously obtained over a long period of time.
- They are conventional sources.
- These are natural sources, which would soon deplete.
- These sources cannot be regenerated.
- Examples: Coal, petroleum, and natural gas.
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The underlined word in the following sentence have been jumbled up. Write them in their correct form.
Nutsgilh is an example of inexhaustible natural resources.
Complete the crossword in figure with the help of the clues:

Across
1. Fuels obtained from dead remains of living organisms. (6, 5)
2. A process by which the various constituents of petroleum are separated. (8)
3. A porous black substance obtained from coal. (4)
4. Another name for motor fuel. (6)
Down
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6. Fuel for heavy motor vehicles. (6)
7. A petroleum product used for road surfacing. (7)
8. Dead remains of sea animals got converted into it. (9)
