The Hydrological Cycle

  • Water evaporates from soil and surface waters and is transpired by vegetation.
  • This water returns to the earth as rainfall. 
  • In addition, water moves from land areas to the ocean as runoff in streams, rivers and groundwater flows. 
  • Humans influence the hydrological cycle in many ways. 
  • For instance, humans divert runoff, decrease the amount of water held in soil by destroying natural vegetation, increase rainfall via air pollution, and pollute water.

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