
Formation

A major scientific explanation of how rain forms and falls is called the Bergeron process. More recent research points to the influence of Cloud condensation nuclei released as the result of biological processes.
Human influence

Classifying the amount of rain
When classified according to amount of precipitation, rain can be divided into:
@ Very light rain — when the precipitation rate is <>@ Light rain — when the precipitation rate is between 0.25 mm/hour - 1.0 mm/hour
@ Moderate rain — when the precipitation rate is between 1.0 mm/hour - 4.0 mm/hour
@ Heavy rain — when the precipitation rate is between 4.0 mm/hour - 16.0 mm/hour
@ Very heavy rain — when the precipitation rate is between 16.0 mm/hour - 50 mm/hour
@ Extreme rain — when the precipitation rate is > 50.0 mm/hour
Properties

On average, raindrops are 1 to 2 mm in diameter.
The biggest raindrops on Earth were recorded over Brazil and the Marshall Islands in 2004 — some of them were as large as 10 mm. The large size is explained by condensation on large smoke particles or by collisions between drops in small regions with particularly high content of liquid water.
Generally, rain has a pH slightly under 6. This is because atmospheric carbon dioxide dissolves in the droplet to form minute quantities of carbonic acid, which then partially dissociates, lowering the pH. In some desert areas, airborne dust contains enough calcium carbonate to counter the natural acidity of precipitation, and rainfall can be neutral or even alkaline. Rain below pH 5.6 is considered acid rain.
Effect on agriculture

Agriculture of all nations at least to some extent is dependent on rain. Indian agriculture, for example, (which accounts for 25 percent of the GDP and employs 70 percent of the nation's population) is heavily dependent on the rains, especially crops like cotton, rice, oilseeds and coarse grains.
Culture

Rain may be harvested, though rainwater is rarely pure (as acid rain occurs naturally), or used as greywater. Excessive rain, particularly after a dry period that has hardened the soil so that it cannot absorb water, can cause floods.
Many people find the scent during and immediately after rain especially pleasant or distinctive. The source of this scent is petrichor, an oil produced by plants, then absorbed by rocks and soil, and later released into the air during rainfall. Light or heavy rain is sometimes seen as romantic.
Mythology
The Ancient Greeks believed that rain was a sign of the gods' anger towards them. They thought that it symbolised drowning and frustration as it often disturbed what they were doing.
Related Links:
Acid rain ,Basic precipitation ,Cherrapunji ,Cloud ,Johad ,Mawsynram ,Meltwater ,Raining animals ,Rain dancing ,Rain sensor ,Red rain in Kerala ,Sanitary sewer overflow ,Water cycle ,Water resources ,Weather ,Yellow rain.
The Ancient Greeks believed that rain was a sign of the gods' anger towards them. They thought that it symbolised drowning and frustration as it often disturbed what they were doing.
Related Links:
Acid rain ,Basic precipitation ,Cherrapunji ,Cloud ,Johad ,Mawsynram ,Meltwater ,Raining animals ,Rain dancing ,Rain sensor ,Red rain in Kerala ,Sanitary sewer overflow ,Water cycle ,Water resources ,Weather ,Yellow rain.
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