The atmosphere is divided into five layers. It is thickest near the surface and thins out with height until it eventually merges with space.

The Earth's atmosphere is about 300 miles 480 km.

Our atmosphere protects us from the sun, asteroids, and creates our weather.Troposphere: This is the lowest atmospheric layer and is about seven miles (11 km) thick. Most clouds and weather are found in the troposphere. The troposphere is thinner at the poles (averaging about 8km thick).

75% of the atmosphere’s mass is in the troposphere. We can find most of the air vapor in this layer. The height could be from 5 km to 20 km. The height could be different because our surface is not smooth, there could be places where it will be nearer to us, like on Mount Everest, the distance would be 5 km. If you are on the south pole, it could be around 7 km.

The atmosphere consists of 78% nitrogen, 21% oxygen, 1% water vapor, and a minute amount of other trace gases like argon, and carbon monoxide. All of these gases combine to absorb ultraviolet radiation.The common name given to the atmospheric gases used in breathing and photosynthesis is air. By volume, dry air contains 78.09% nitrogen, 20.95% oxygen,[1] 0.93% argon, 0.039% carbon dioxide, and small amounts of other gases

the exosphere is the uppermost layer, where the atmosphere thins out and merges with interplanetary space. It is located directly above the thermosphere

Several moons, such as earth moons have exospheres without a denser atmosphere underneath.

s the layer of the earth atomsphere  that is directly above the stropause  and directly below the mesopause In the mesosphere temperature decreases with increasing height. The upper boundary of the mesosphere is the mesopause

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