About: http://webisa.webdatacommons.org/402586882

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	In some geologically active areas (e.g. African rift valley) water extracted from crystalline rocks such as granite may contain high concentrations of chemicals such as fluoride, which can be harmful to health.
http://www.w3.org/ns/prov#wasQuotedFrom	who.int