(i) Atmosphere is a thin blanket of air that surrounds the earth. It protects us from the harmful rays of
the sun. It consists of several gases in which nitrogen and oxygen occupy the major portion.
(ii) Nirtrogen (78%) and oxygen (21%) make the bulk of the atmosphere.
(iii) Carbon dioxide creates greenhouse effect in the atmosphere.
(iv) Weather is hour-to-hour, day-to-day condition of the atmosphere.
(v)
* Convectional rainfall
* Orographic rainfall
* Cyclonic rainfall.
(vi) The pressure exerted by the weight of air on the earth’s surface is known as air pressure.
