The first layer of earth’s atmosphere is ______.
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. Troposphere
The troposphere is the lowest layer of our atmosphere.
- Starting at ground level, it extends upward to about 10 km (6.2 miles or about 33,000 feet) above sea level.
- We humans live in the troposphere, and nearly all weather occurs in this lowest layer.
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Its average height is 13 km. The thickness varies from 8 km to 18 km, with a maximum at the equator and a minimum poles.
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All the atmospheric phenomena such as rain, wind, clouds, etc. take place in this layer.
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The troposphere contains roughly 80% of the mass of Earth's atmosphere and it composed of composed of nitrogen (78%) and life-giving gas oxygen (21%) with small concentrations of other trace gases.
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Hence, the Troposphere is very important for the existence of life on Earth as it causes cloud formation, and rain and maintains the heat balance of the Earth.