Chemical Cycles

Chemical Cycles - SCI Notes 2/17 Laposata Chemical Cycles...

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SCI Notes 2/17 Laposata Chemical Cycles General Cycle Characteristics o Flux Rate: Amount entering or leaving a reservoir per unit time (high flux rate = rapid cycling) o Residence Time: length of time material stays in reservoir Tectonic Cycle o Creation/destruction of lithosphere (crust) o Lithosphere: 60 miles thick, moving tectonic plates o Seafloor Spreading: New lithosphere formed in ocean trenches o Subduction zone: Plates converge, one driven under other Hydrologic Cycle o Cycling of water through soil, atmosphere, surface, waters, ice caps, glaciers o Water: Can be liquid, solid, or vapor Biogeochemical Cycles o Cycling of chemical elements o Chemical Elements: Carbon Nitrogen Phosphorus o Cycling: Involves living things (bio) Geological processes (geo)
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o Elements cycling Elements can form different compounds while cycling o Rates of cycling Relatively fast: Water-soluble, has a gas phase o Ex. Nitrogen, Sulfur, Carbon Relatively Slow:
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Chemical Cycles - SCI Notes 2/17 Laposata Chemical Cycles...

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