What causes rain?

Rain is caused because of three main phenomena of the hydrologic cycle. They are

Evaporation:

Water is absorbed from different water bodies, a large amount of which vaporizes and enters the atmospheric air. Water gets evaporated because of various other biological processes as well. 

Condensation:

The hot air containing water molecules thus rises above the ground level expands and cools after reaching a suitable height. On cooling, water vapour turns into droplets of water, this process is called condensation. It is facilitated by substances such as dust and other particles suspended in the air which accelerates the process and forms the nucleus for these droplets. 

Precipitation:

The cluster of such droplets clamps together to form huge water masses appearing to us like clouds. Once they grow big and heavy, they fall down to the ground as rain. When the temperature is lower than 0 degrees celsius, precipitation takes place in the form of fine flakes of snow and is called snowfall. 

Further Reading:

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