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Text File  |  2001-09-04  |  406b  |  10 lines
  1. Biogeochemical Cycles
  2. Movements through the Earth system of key chemical constituents essential to life, such as carbon, nitrogen, oxygen, and phosphorus. 
  3.  
  4.  
  5. Hydrologic Cycle
  6. The pathways through which water is cycled in the terrestrial biosphere. 
  7.  
  8.  
  9. Physical Climate System
  10. The system of processes that regulate climate, including atmospheric and ocean circulation, evaporation, and precipitation