Assertion: dust storm | /r/HasProperty | cyclical phenomena
Facets:
value: historically
type: TEMPORAL
Source sentences:
text: Historically, dust storms are a cyclical phenomena triggered by droughts: during the Millennium drought there were several large dust storms, as well as the droughts in the 1960s and also during the Depression and WWII.
text: Dust storms are a cyclical phenomenon which occur when hot, dry wind, usually above 30km/h, picks up dust and carries it from west to east as a cold front moves through.