Assertion: desert | /r/HasProperty | one of the best places
Facets:
value: to conduct astronomical observations
type: PURPOSE
value: because of its high altitude
type: CAUSE
Source sentences:
text: Because of its high altitude, nearly nonexistent cloud cover, dry air, and lack of light pollution and radio interference from widely populated cities and towns, this desert is one of the best places in the world to conduct astronomical observations.