ABSTRACT
The human body's liquid phase is a combination of water, blood, and other vital liquid chemical substances. Water is Earth's blood, and comparison of the cycle of human blood to Earth's blood cycle is really not a stretch. Additionally, water contains dissolved compounds, including various carbonates, sulfates, silicates, and chlorides. Water is called the "universal solvent" because it dissolves more substances than any other liquid. The natural water cycle or hydrological cycle is the means by which water in all three forms—solid, liquid, and vapor—circulates through the biosphere. Three different methods of transport are involved in the water movement: evaporation, precipitation, and runoff. Watershed protection is one of the barriers in the multiple-barrier approach to protecting source water. Water regulates population growth, influences world health and living conditions, and determines biodiversity. The actual amount of water in an aquifer depends on the amount of space available between the various grains of material that make up the aquifer.
