Composition and Structure of Atmosphere
CBSE · Class 11 · Geography
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What is the atmosphere and why is it essential for life?
Answer
The atmosphere is a mixture of different gases that envelops the Earth. It is essential for life because it contains life-giving gases like oxygen for humans and animals, and carbon dioxide for plants…
What percentage of the atmosphere's total mass is confined within 32 km of Earth's surface?
Answer
99% of the total mass of the atmosphere is confined to the height of 32 km from the Earth's surface. This shows that the atmosphere becomes very thin at higher altitudes.
What are the three main components of the atmosphere?
Answer
The atmosphere is composed of: 1. Gases (nitrogen, oxygen, carbon dioxide, etc.) 2. Water vapour 3. Dust particles These components vary in proportion at different altitudes.
At what altitude does oxygen become almost negligible in quantity?
Answer
Oxygen becomes almost negligible in quantity at the height of 120 km from Earth's surface. This shows how the proportion of gases changes dramatically in the higher layers of the atmosphere.
Up to what height are carbon dioxide and water vapour found in the atmosphere?
Answer
Carbon dioxide and water vapour are found only up to 90 km from the surface of the Earth. Beyond this height, these gases are virtually absent.
Why is carbon dioxide meteorologically important and how does it contribute to the greenhouse effect?
Answer
Carbon dioxide is meteorologically important because: 1. It is transparent to incoming solar radiation 2. It is opaque to outgoing terrestrial radiation 3. It absorbs terrestrial radiation and reflect…
What has caused the recent increase in atmospheric carbon dioxide levels?
Answer
The volume of carbon dioxide has been rising in the past few decades mainly because of the burning of fossil fuels. This increase has also contributed to rising air temperatures globally.
Where is ozone found in the atmosphere and what is its main function?
Answer
Ozone is found between 10 and 50 km above Earth's surface. Its main function is to act as a filter that absorbs ultraviolet rays from the sun and prevents them from reaching Earth's surface, protectin…
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Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
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