# hydrogen cycle

> hydrogen exchange between the living and non-living world

**Wikidata**: [Q2499580](https://www.wikidata.org/wiki/Q2499580)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Hydrogen_cycle)  
**Source**: https://4ort.xyz/entity/hydrogen-cycle


## References

1. Freebase Data Dumps. 2013