Our atmosphere is divided into five layers starting from the earth’s surface. # Troposphere - the most important layer of the atmosphere. Its average height is 13 km. The air we inhale exists here. Most weather phenomena like rainfall, hailstorm, etc. occur in this layer. # Stratosphere- just above the troposphere lies the stratosphere. It extends up to a height of 50 km. Being free from associated weather phenomenon, this layer is most ideal for flying aeroplanes. Contains ozone. # Mesosphere-: This is the next & third layer of the atmosphere. It lies above the stratosphere. It extends up to a height of 80 km. # Thermosphere -In thermosphere temperature rises very rapidly with increasing height. The ionosphere is a part of this sphere. It extends between80-400 km. This layer helps in radio communications. # Exosphere-The last & upper most layer of the atmosphere is known as exosphere.