Answer / raghavendra tripathi

Fog formation at high altitudes is called a cloud. Air expands when it rise, gradually to the upper layer of atmosphere and causes necessary cooling. During day time earth gets heated by sun and the moist air in contact with the earth’s surface becomes warm and higher and rises upward. There it expands adiabatically and is cooled below the saturating point. Excess of moisture is condensed or suspended dust particles as minute globules of which from cloud

Whenever two or more drops of water in a cloud come in contact and coalesce to form bigger drops they fall as rain. Raining is there when

(i)Drops become sufficiently big in size and are heavier.

(ii)The relative humidity of atmosphere becomes very high so that evaporation of water drops does not take place

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