Answer: D. Surface and underground water
Hydrology is the science which deals with surface and underground water.
The word hydrology is made of Hydro and logy, “Hydro” means water and “logy” means science.
It means that hydrology is the science in which the study of water on or below the earth’s surface is carried out.
Hydrology also comprises the occurrence and movement of water below the earth's surface. It also comprises physical and chemical properties of water. Hence, hydrology is the science which deals with surface and underground water.
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