Answer :
80% of the atmosphere’s mass is near the troposphere with 99% being below 20 miles (32 km).
Depending on the temperature profile, the layers of the atmosphere on Earth are separated. Troposphere, stratosphere, mesosphere, and exosphere are the four. The troposphere, the lowest part of the atmosphere on Earth, is where almost all meteorological phenomena occur. In the equator, the troposphere reaches a height of 17–18 km, while it rises as high as 10 km near the poles and high latitudes. All meteorological phenomena occur in the troposphere, and as one ascends higher, the temperature drops.
This temperature declines at a rate of about 6.5 degrees Celsius per kilometre ( it will change with atmospheric conditions). Because of the ferocious convective air within the layer, the term "troposphere" (which means "area of mixing") was coined. The troposphere contains 80% of the mass of the atmosphere. Ninety-nine percent of the atmosphere's composition is water vapour. The term "tropopause" refers to the top boundary of the troposphere, when temperatures are stable for a few kilometres.
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