VI. Write short notes on the following.
1. The composition of air
2. Global Warming
3. Nitrogen Fixation
4. Ozonesphere
VII. Answer in brief.
What do you mean by atmosphere?
What is the role played by ozone?
Name the four vital gases of the atmosphere.
Name the coldest layer of the atmosphere.
What do you mean by 'normal lapse rate'?
VIII. Answer the following questions.
1. Describe the structure of the atmosphere.
2. How does the atmosphere serve as a protective blanket for earth?
3. Explain the composition of the thermosphere.
4. Give a brief description of troposphere.
5. What is 'Greenhouse effect? How does it cause global warming?
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Answers
Explanation:
1) Air is made up of 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.04% carbon dioxide, and other gases in meager amounts. Water vapor is also a constituent of air in varying amounts along with dust particles.
2) Global warming is that the long-term heating of Earth's climate system observed since the pre-industrial period (between 1850 and 1900) thanks to human activities, primarily fuel burning, which increases heat-trapping greenhouse emission levels in Earth's atmosphere.
3)Nitrogen fixation is the process by which atmospheric nitrogen is converted by either a natural or an industrial means to a form of nitrogen such as ammonia. In nature, most nitrogen is harvested from the atmosphere by microorganisms to form ammonia, nitrites, and nitrates that can be used by plants.
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