Water is fundamental to every living being on Earth. Up to 70% of the human body is made up of water, and it is the medium in which the chemical reactions necessary to sustain life take place.

The water cycle, also referred to as the hydrological cycle, is made up of different processes which move water around the Earth. There is a finite amount of water found in differenthydrological stores位于上面and below the Earth’s surface.Processessuch as precipitation, groundwater flow, infiltration, and condensation transport water from one store to another.

Figure 1:A labeled overview of the water cycle