Earth's atmosphere

Earth's atmosphere is made up of gases.

Oxygen 21%, Nitrogen 78%, Argon 0.93%, Carbon dioxide 0.038%.

The movement of atmospheric air is called wind. Force of Gravity holds the atmosphere in place.

Homosphere- the region up to 90 km height from the Earth's surface.

Heterosphere- the region above 90 km height.

Homosphere consists of 5 regions ;-

1).Troposphere- the bottom most region of atmosphere. It extends up to 17 km at the equator & 9 km in the poles.

Living beings including humans live in this sphere. With altitude temperature decreases at a rate of 6.4℃/km. This phenomenon is called as Normal lapse rate. Tropopause divides troposphere & stratosphere.

2).Stratosphere- this zone extends up to 50 km. No clouds in this region.

The temperature at the bottom remains constant, but increases gradually upwards due to the chemical conversion of oxygen into Ozone.

Ozone is blue in colour.

Nimbus-7 was the space shuttle launched to find ozone.

Jet crafts fly along the lower stratosphere because of less weather troubles.

Air is light & dry.

Stratopause divides stratosphere & mesosphere.

3).Mesosphere- this region extends up to 80 km altitude. With altitude temperature decreases in this zone.

Meteorites get dispersed off in the region.

 Mesopause divides mesosphere & thermosphere. Atmospheric temperature reaches its lowest at mesopause.

Ionosphere- lies in mesosphere & thermosphere. Ionized particles are found here.

4).Thermosphere- Atmospheric temperature reaches maximum at this area up to 700℃. Low air density.

Space shuttles & International space station lies in this region.

Aurora Borealis, Aurora Austrialis happens here.The charged particles from space strikes with atmospheric particles giving rise to this phenomenon.

5).Exosphere- It's the topmost region on Earth's atmosphere mainly consist of Hydrogen & Helium. The region meets with Space.