Which one of the following is the common term to describe the main source of water for human withdrawals?
Green water
Hard water
Blue water
Storm water
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This question was previously asked in
UPSC Geoscientist – 2020
In hydrology, water resources are often categorized. Green water refers to precipitation that infiltrates the soil and is available for plants. Blue water refers to the surface water (in rivers, lakes, reservoirs) and groundwater stored in aquifers. This blue water is the main source that is withdrawn by humans for various uses, including irrigation, industrial processes, and domestic consumption (drinking, sanitation).