Hydrology is the study of the movement, distribution, and quality of water on Earth, including water resources and their interaction with the environment. It involves analyzing the physical and chemical properties of water, as well as studying how water moves through various systems such as rivers, lakes, and groundwater. Hydrologists use a combination of field observations, laboratory experiments, and mathematical models to better understand the behavior of water in the natural environment. This research area is important for managing water resources, predicting floods and droughts, and protecting water quality for human and ecosystem health.