About: http://webisa.webdatacommons.org/443215256

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	Hard and massive surfaces???concrete walls, for instance???reflect the sound with modest attenuation, while softer surfaces absorb much of the sound, especially the high frequency components.
http://www.w3.org/ns/prov#wasQuotedFrom	earlevel.com