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प्रश्न
Fill in the blanks and complete the story.
About 300 million years ago, the earth had dense ______ in low lying wetland areas. Due to natural processes like ______, these forests got buried under the ______. As more ______ deposited over them, they were compressed. The ______ also rose as they sank deeper and deeper. Under high ______ and high ______, dead plants got slowly converted into coal.
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उत्तर
About 300 million years ago, the earth had dense forests in low lying wetland areas. Due to natural processes like floods, these forests got buried under the soil. As more soil deposited over them, they were compressed. The temperature also rose as they sank deeper and deeper. Under high pressure and high temperature, dead plants got slowly converted into coal.
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संबंधित प्रश्न
Coal is said to be formed from the wood of trees. Why then is coal considered to be a non-renewable source of energy whereas wood is a renewable source of energy?
A non-renewable source of energy is:
(a) wood
(b) alcohol
(c) hydrogen gas
(d) natural gas
Write a short note on the pollution caused by burning fossil fuels.
Name the clean fuel which can be obtained from cow-dung.
Apart from cattle dung, what other substances can be added to a biogas plant?
What do you know about wind energy?
Explain why is it no wise to regard wood as a renewable sources of energy.
Higher Order Thinking Skill (HOT)
What are the objectives for replacing non-conventional energy resources from conventional energy resources?
Which of the following is a pair of exhaustible natural resources?
Write True/False against the following statement.
Wildlife is an exhaustible natural resource.
