is rain water the ultimate source of water? .Please explain as i have my exam tomorrow

No, We can't say that rain water is the ultimate source of water. Rivers, lakes & oceans contribute a lot in rainfall as water gets evaporated from all of these sources. This evaporated water returns to the earth in the form of rain.

@Divya:- Good efforts, keep contributing!!

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no, :)

desalination have enabled us to reduce our dependancy on rain water:)

we use salt water from the sea and ground water and river water  etc...

hope it helps:)

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You have a constant amount of water on earth .

Water vapour is given out by the process of transpiration in plants ,Evapouration  of sea water and all create rainfall.

So , there are seas, rivers, lakes , ponds, groundwater ,etc.. 

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