Its 10 km thick.
The stratosphere is typically about ten times thicker than the troposphere. It extends from about 10 to 50 kilometers above the Earth's surface, while the troposphere is only about 10-15 kilometers thick.
The troposphere can vary in thickness from about 8 km at the poles to 16 km at the equator. The mesosphere is typically around 50 km thick.
The lowest part of the atmosphere is called the troposphere. It is where most weather events occur and contains approximately 75% of the atmosphere's total mass.
It is approximately 5 1/2 miles (29000 ft or 9 km) thick
Aerospace, the troposphere is 110 miles thick in the equator and 6 miles thick in the polar regions. It could also be called atmosphere, there are different types of atmosphere- troposphere, stratosphere, mesosphere and thermosphere the hottest part of our atmosphere- which is quite peculiar since the high you get the colder it is. The stratosphere also contains the 'ozone layer' which is now depleted repetitively by CFC (chloro, fluoro, carbon).
The thinnest layer of Earth's atmosphere is the exosphere, which extends from about 600 kilometers above sea level to about 10,000 kilometers. However, if you are referring to the layer that is approximately 12 kilometers thick, that would be the troposphere, which is the lowest layer of the atmosphere where weather occurs. The troposphere varies in thickness, being thicker at the equator and thinner at the poles, but on average, it is around 12 kilometers thick.
I would assume that they would pop somewhere above the troposphere at about 35 kilometers, because it is said that balloons pop when they enter the stratosphere which is located directly above the troposphere. The troposphere is around 30 kilometers thick.
The Earth's atmosphere is about 480 kilometers thick, with the majority of its mass concentrated within the first 11 kilometers (troposphere). The outermost layer, the exosphere, extends beyond 10,000 kilometers.
It appears there may be a typo in your question. Did you mean "troposphere"? The troposphere is the lowest layer of the Earth's atmosphere and is where most weather occurs. It is approximately 8 to 15 kilometers (5 to 9 miles) thick and contains the majority of the atmosphere's mass.
Because in atmospheric layers above the troposphere, there isn't enough oxygen to support the kind of energy consumption that birds require. Also, because the air isn't thick enough to provide sufficient lift at high altitude.
The troposphere is thinnest at the poles, where it is about 8 kilometers thick, compared to about 16 kilometers at the equator. This is due to the lower temperature at the poles, which causes the air to be more compact and the layers to be thinner.
The atmosphere is divided into five layers: troposphere, stratosphere, mesosphere, thermosphere, and exosphere. The thickness of each layer varies, with the troposphere being the thickest at around 7-10 miles (11-16 km) and the exosphere gradually merging with outer space.