About: http://webisa.webdatacommons.org/52548131

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	Why can not we see air? is explained as follows: he is because Earth atmosphere is made of several gases including oxygen, water vapor and carbon dioxide.
http://www.w3.org/ns/prov#wasQuotedFrom	amazon.com