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Question
What are renewable energy resources?
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Solution
Renewable energy resources are those that come from natural sources and are naturally replenished. These include solar energy (sunlight), wind energy from windmill (wind), hydroelectricity (rain), tidal energy from waves (tides), and geothermal energy (energy from the heat of the earth).
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RELATED QUESTIONS
Fill in the following blank with a suitable word:
The amount of heat produce by burning a unit mass of a fuel completely is known as its ............ value.
Which of the following fuels has the highest calorific value?
(a) natural gas
(b) methane gas
(c) hydrogen gas
(d) biogas
Explain why, natural gas is considered to be a good fuel.
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What are the various steps which can be taken to control (or reduce) pollution caused by burning fossil fuels?
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(b) uranium
(c) petroleum
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Can you tell?
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Exhaustible natural resources are
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Match the items given in Column I with the items of Column II.
| Column I | Column II |
| (a) Used for road surfacing | (i) Black gold |
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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)
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8. Dead remains of sea animals got converted into it. (9)
