science that deals with the water above, on and below the land surface of the earth

Hydrology [1] is the study of movement, distribution, and quality of water throughout the Earth.[2] A person who studies hydrology is called a hydrologist.

Water covers 70% of the Earth's surface
Vew of Fernando de Noronha, Brazil

The central theme of hydrology is how the water circulates. This is called the water cycle. The most vivid illustration of it is the water evaporation from the ocean with the formation of clouds. These clouds drift over the land and produce rain.[3]

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  1. from Greek: Yδωρ, hudōr, "water"; and λόγος, logos, "study"
  2. "What is hydrology and what do hydrologists do?". Archived from the original on 2014-02-22. Retrieved 2011-03-11.
  3. "Basic Ground Water Hydrology". Archived from the original on 2010-12-13. Retrieved 2011-03-11.