Composition and Structure of Atmosphere — Flashcards
ICSE · Class 11 · Geography
38 flashcards for Composition and Structure of Atmosphere (ICSE Class 11 Geography) to test yourself on key terms and facts.
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What is the atmosphere?
Answer
The atmosphere is the vast expanse of air that envelopes the Earth all around. It is held to the Earth by gravitational attraction. It is colourless, odourless, and tasteless, and it gradually merges …
Define atmosphere according to F.J. Monkhouse.
Answer
"The atmosphere is a thin layer of gas held to the earth by gravitational attraction." This definition highlights that air stays around Earth because of gravity.
Define atmosphere according to H.J. Critchfield.
Answer
"The atmosphere is a deep blanket of gases which entirely envelopes the earth." This definition shows that the atmosphere surrounds Earth like a protective covering.
How thick is the atmosphere according to latest discoveries?
Answer
The atmosphere is about 32,000 km thick. It does not have a sharp upper limit and gradually merges with outer space.
What are the main gases of dry air and their proportions?
Answer
Nitrogen is 78.03% and oxygen is 20.99% of atmospheric volume. Together, they make up over 99% of the air by volume. Other gases are present only in very small amounts.
Why is nitrogen important in the atmosphere?
Answer
Nitrogen is the largest component of the atmosphere. It helps in maintaining atmospheric pressure, force of winds, and reflection of light. It also helps plants by supporting protein formation. It ext…
Why is oxygen called the life-giver gas?
Answer
Oxygen is essential for breathing and helps in burning fuel. It is the main source of energy for living beings and supports industries. It forms 20.99% of atmospheric volume, extends up to 64 km, and …
Why is carbon dioxide important even though it is present in very small quantity?
Answer
Carbon dioxide forms only 0.04% of the atmosphere, but it is essential for vegetation growth. It is also transparent to incoming solar radiation and opaque to terrestrial radiation, so it helps in the…
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