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Rain plays a role in the hydrologic cycle in which moisture from the oceans evaporates, condenses into bubbles, precipitates up to the sky, and eventually returns to the air via sun light and rivers to repeat the cycle again. The water vapor that respires from planets, evaporates to join other water molecules in condensing into bubbles.

Rain is sampled by two categories, namely, amount of precipitation and reason for precipitation

When classified according to amount of precipitation, rain can be divided in to:[citation needed]

  • very light rain — when the amount of precipitation is < 250 mm (< 250 liter/m²)
  • light rain — when the amount of precipitation is between 250 mm - 750 mm (250 liter/m² - 750 liter/m²)
  • moderate rain — when the amount of precipitation is between 750 mm - 1500 mm (750 liter/m² - 1500 liter/m²)
  • heavy rain — when the amount of precipitation is between 1500 mm - 2000 mm (1500 liter/m² - 2000 liter/m²)
  • very heavy rain — when the amount of precipitation is > 2000 mm (> 2000 liter/m²)

Based on the reason for precipitation, rain is classified into:

  • Heavy Rain
  • Light Rain
  • Downpour Rain
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http://upload.wikimedia.org/wikipedia/commons/f/f4/Regnbyge.jpg
http://upload.wikimedia.org/wikipedia/en/0/09/Raindrops.jpg
http://upload.wikimedia.org/wikipedia/en/6/6c/Rain_in_Kolkata.jpg
http://upload.wikimedia.org/wikipedia/en/4/46/Rain_in_Kerela_01.jpg
http://upload.wikimedia.org/wikipedia/en/4/4e/Umbrella_with_raindrops.jpg
http://www.mk-magazine.com/diaryofadamnedman/archives/rain.jpg
http://www.rutahsa.com/RAIN.jpg
http://thomashawk.com/hello/209/1017/1024/San
http://fizyka.phys.put.poznan.pl/~pieransk/Physics
http://www.quietlywild.com/qwpix/recentpix/RainDrops.jpg
http://upload.wikimedia.org/wikipedia/commons/f/f3/Rain_to_clear_skies_panorama.jpg
Rain