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Question
About 90 percent of air mass lies within about ______ from the earth's surface.
Options
20 km
22 km
25 km
30 km
MCQ
Fill in the Blanks
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Solution
About 90 percent of air mass lies within about 20 km from the earth's surface.
Explanation:
About 90% of the air mass of the atmosphere is concentrated within the first 20 km from the Earth's surface due to gravity pulling air molecules closer to the planet.
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