Question

how does water exist on earth on different states

Answer 1

water exist on earth in different states
as liquid in river or ocean
as glaciers
as vapour in atmosphere

Answer 2

Here is your answer 
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            water occurs in 3 states in the earth. 
     That 3 states are as Follows 

1) Solid 
2) Liquid 
3) Gas 

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                 Water is the most important matter in the world because water is necessary for all living Beings. 

 any living things can't live without water  

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There are the 3 important natural resources and they are 
=> 
1) Air 

2) Water 

3) Soil