About: http://webisa.webdatacommons.org/190890493

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	You could also do a more chemistry-based extension to have students test for specific heavy metal and toxic contaminants such as lead and arsenic and research what methods are used to reduce these contaminants.
http://www.w3.org/ns/prov#wasQuotedFrom	teacherstryscience.org