A biogeochemical cycle of a chemical element is the natural and human-modified circuit including all aspects of its chemical/physical interactions through the biosphere. The Earth's biosphere is the interactive whole consisting of the living organisms themselves plus the atmosphere, hydrosphere (oceans, rivers, lakes, glaciers, icecaps, and subsurface water), soil and subsurface of the crust down to life's upper temperature limit. The climate is defined here as the physical characteristics of the atmosphere, particularly the surface temperature.
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