The Biogeochemical cycle reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Biogeochemical cycle

In ecology, a biogeochemical cycle is a circuit where a nutrient moves back and forth between both biotic and abiotic components of ecosystems.

Some cycles are

• nitrogen cycle
• oxygen cycle
• carbon cycle
• phosphorous cycle
• sulphurous cycle
• water cycle

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