About: http://webisa.webdatacommons.org/309466617

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	They look like scratches or deep grooves with material sloshed to the sides such as in Figure 7 or have more intricate forms.
http://www.w3.org/ns/prov#wasQuotedFrom	thunderbolts.info