About: http://webisa.webdatacommons.org/178685925

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	The grains and pebbles of sand and gravel are composed mostly of quartz, but many are fragments of pink and white feldspar and other igneous rocks.
http://www.w3.org/ns/prov#wasQuotedFrom	ku.edu