Water scarcity is the sufficent available water reesources 2 meet  the demand of water usage within the water 1 ..  use of water without control ... 2water is becoming dirty by throwing waste harmful chemicals .so we cant use 3 pollution is the 3rd becauses more wate is demanded ...........
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Water Scarcity refers to the state of acute water shortage especially potable (Drinking) water.

Main causes:
i) Contamination of water
ii) Drying up of rivers from which water was taken, purified and then made fit for drinking.