About: http://webisa.webdatacommons.org/208708181

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 tropical circulation, it rains at the equator and then the sinking air dries and makes the Sahara and the Kalahari and other deserts, and those seem to be expanding a little bit.
http://www.w3.org/ns/prov#wasQuotedFrom	nsf.gov