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Ice is the ______ form of water.
_________ fills rivers, ponds, lakes and oceans.
Water droplets from the ______ fall as rain.
Water vapour forms _________.
In the water cycle, water gets heated by the _______ and rises up as water vapour.
The natural cycle of water in which it changes from one form to another is called __________.
Water falling down as rain or snow is called _________.
The process by which water vapour changes into water is called ___________.
The process by which water changes into water vapour is called __________.
__________ is the gas we breathe out.
________ is the gas we breathe in.
The layer of air surrounding the Earth is called ________.
Vapour is the ________ form of water.
Water is the _______ form of water.
What cannot be seen, but we can feel it ___________.
Ice, water and water vapour are the three forms of ______.
When water is boiled, steam is formed. The steam is called ________.
Water takes the shape of the ________ in which it is kept.
Water has no fixed _______.
Why do the mountaineers carry oxygen for breathing when they climb up?
What do the mountaineers carry in big cylinders on their back?
Human beings and animals need _________ for breathing.
All living beings need _______ for survival.
Where does the dust come from?
The amount of water vapour in the air is very high during _______ days.
There is no air in _________.
The layer of air which surrounds the Earth is called __________.
The earth is surrounded by a layer of _________.