# chalk

> soft, white, porous sedimentary rock

**Wikidata**: [Q183670](https://www.wikidata.org/wiki/Q183670)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Chalk)  
**Source**: https://4ort.xyz/entity/chalk


## References

1. [Source](https://encyklopedia.pwn.pl/haslo/kreda;3927262.html)
2. Freebase Data Dumps. 2013
3. BBC Things
4. YSO-Wikidata mapping project
5. BabelNet
6. Environment Ontology
7. Quora
8. UN Comtrade Commodity Classifications
9. National Library of Israel Names and Subjects Authority File
10. KBpedia