Assertion: thunderstorm | /r/HasProperty | rare
Facets:
value: in winter
type: TEMPORAL
value: in polar regions
type: LOCATION
value: because of cold weather
type: CAUSE
value: because of cold surface temperatures
type: CAUSE
Source sentences:
text: Thunderstorms are rare in polar regions because of cold surface temperatures.
text: Thunderstorms are rare in winter, mostly because of cold weather.