# Active layer

> layer of topsoil above permafrost

**Wikidata**: [Q201890](https://www.wikidata.org/wiki/Q201890)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Active_layer)  
**Source**: https://4ort.xyz/entity/active-layer


## References

1. Freebase Data Dumps. 2013
2. [OpenAlex](https://docs.openalex.org/download-snapshot/snapshot-data-format)