About: http://webisa.webdatacommons.org/251366505

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	Electric fields are effectively shielded by materials such as trees or buildings, whereas magnetic fields are not easily shielded by objects or materials.
http://www.w3.org/ns/prov#wasQuotedFrom	ca.gov