Hydrology[4][5]is predominantly concerned with the amounts and quality of water moving and accumulating on the land surface and in the soils and rocks near the surface and is typified by thehydrological cycle. Thus the field encompasses water inrivers,lakes,aquifersand to an extentglaciers, in which the field examines the process and dynamics involved in these bodies of water. Hydrology has historically had an important connection withengineeringand has thus developed a largely quantitative method in its research; however, it does have anearth scienceside that embraces the systems approach. Similar to most fields of physical geography it has sub-fields that examine the specific bodies of water or their interaction with other spheres e.g.limnologyandecohydrology.