Theory:

Water is found in three forms. They are as follows:
  1. Solid form
  2. Liquid form
  3. Gaseous or vapour form
The water that circulates in the water cycle can be found in all the three forms.
 
1.  Solid form:
 
Water is found in the solid form as snow on the mountains and ice as in the ice caps at the poles of the earth. The mountains that are covered by snow are known as glaciers.
 
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Mountains covered with snow
 
2.  Liquid form:
 
Water is found in liquid form in the oceans, rivers, lakes and in the underground.
 
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Ocean
 
3.  Gaseous form:
 
Water vapour is the gaseous form of water. It is found in the atmosphere.
The total amount of water on the earth is kept constant even though the we are using it, is due to the continuous cycling of water among its three forms.