The planet scale cycles that move a chemical element or compound between the atmosphere, ocean, land and living organisms: the carbon, nitrogen, phosphorus and water cycles. Each is a closed loop with reservoirs and transfer rates rather than a single event, and each underwrites the processes described in the other phenomenon groups.
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1. Wikipedia: Biogeochemical cycle
WikipediaBiogeochemical cycle, Fast and slow cycles section, fast-cycle sentence
Fast or biological cycles can complete within years, moving substances from atmosphere to biosphere, then back to the atmosphere.
Biogeochemical cycle, Fast and slow cycles section, slow-cycle sentence
Slow or geological cycles can take millions of years to complete, moving substances through the Earth's crust between rocks, soil, ocean and atmosphere.
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