Composition and Structure of the Atmosphere
ICSE · Class 9 · Geography
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What is the atmosphere?
How far does the atmosphere extend above the Earth's surface?
What is air in horizontal motion called?
What is the pressure air exerts on the surface called?
Sample Questions
Which of the following are features of air?
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Colourless,Tasteless,Odourless
Air is colourless, tasteless and odourless.
Which two gases together make up about 99% of clean dry air?
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Nitrogen and oxygen
Nitrogen and oxygen make up about 99% of clean dry air.
What percentage of clean dry air is nitrogen?
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78%
Nitrogen forms 78% of clean dry air.
What percentage of clean dry air is oxygen?
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21%
Oxygen forms 21% of clean dry air.
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