The Water Hydrologic CycleAll life depends on water and in its absence life ceases. The kind of vegetation present at a site depends upon the amount of free water available and a principal factor in terrestrial net primary production is the amount of precipitation a site receives. The movement of water on the face of the Earth affects the rate of weathering, the amount of materials carried to the seas and lost to the bottom sediments, the erosion of soils, as well as the global heat balance and rainfall patterns from pole to pole.Water is the carrier of the elements, and all of the biogeochemical cycles include portions of time in the hydrosphere. Water itself cycles and would do so in the absence of organisms (unlike the other major elements, which require organisms in their cycles). Oceans, which cover over three-quarters of the Earth's surface, are the reservoir for water. Evaporation from their surfaces amounts to 425,000
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Water Hydrologic Cycle, Terrestrial net primary, groundwater reservoir. Groundwater