Water falling from the sky!

There's water falling from the sky!

I think it's called "rain".

Main Entry: 1rain
Pronunciation: \ˈrān\
Function: noun
Usage: often attributive
Etymology: Middle English reyn, from Old English regn, rēn; akin to Old High German regan rain
Date: before 12th century
1 a: water falling in drops condensed from vapor in the atmosphere
[Merriam-Webster On-line Dictionary]

I've read about it in books!