Assertion: thunderstorm's lightning | /r/HasProperty | major cause of wildfires
Facets:
value: in canada
type: LOCATION
value: in northwest china
type: LOCATION
value: in the united states
type: LOCATION
Source sentences:
text: Dry thunderstorms occur essentially in dry conditions, and their lightning is a major cause of wildfires.
text: In the United States, Canada, and Northwest China, lightning is the major source of ignition.