What is the reason of rain?
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Two important conditions must be satisfied in order to have rain:
(1) There should be moisture-laden air
(2) There should be some means whereby air is cooled and condensation takes place.
The air obtains water vapours by evaporation from the surface of large bodies of water, usually from the sea.
The moisture-laden air is cooled in two ways:
(i) by rising upward into colder upper regions of the atmosphere
(ii) by blowing as wind to colder regions.
Thus we see:
(a) Moist air is lighter than dry air and so it readily rises, expands in a short time, cools and falls.
(b) When warm winds blow towards cooler regions, it is condensed by cooling effect and rain falls.
(c) The land masses or mountains also tend to condense water vapours. When moisture-laden wind is
obstructed by mountains, it is forced to rise. As it rises, it becomes cool and rainfall results.
The clouds in the sky are made up of tiny water droplets, which rise into the air when the Sun heats the sea. The droplets get larger and heavier and form cloud.
Then fall to the ground as rain. This water runs into rivers, which flow from the land back to the sea. This never-ending journey is called the water cycle.
Rain Process in 3 step :-
1. Rising Water
The Sun heats the sea and turns the water into invisible water vapor, which rises into the air. The warm water vapor cools into millions of tiny water droplets, which form clouds
2. Drifting clouds
Winds blow the clouds over the land. When the clouds drift into cooler air, the tiny water droplets start to join together to form larger, heavier raindrops
3. Falling rain
When the water droplets get too large and heavy, they fall as rain. Cold air above high mountains often freezes the water, which then falls as hail or snow.