A) precipitation
B) run-off water
C) groundwater
D) evaporation
Correct Answer: B
Solution :
Run-off water refers to the water which falls during rainfall (precipitation) and goes back to the source, eg, sea, ocean etc. In this way, a large amount of fresh water gets wasted. So, the greatest problem of water conservation is to reduce the amount of run-off water.You need to login to perform this action.
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