# oxygen cycle

> biogeochemical cycle of oxygen within its four main reservoirs: the atmosphere, the biosphere, the hydrosphere, and the lithosphere

**Wikidata**: [Q1140866](https://www.wikidata.org/wiki/Q1140866)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Oxygen_cycle)  
**Source**: https://4ort.xyz/entity/oxygen-cycle


## References

1. Freebase Data Dumps. 2013
2. Integrated Authority File