Assertion: coal mining | /r/HasProperty | dangerous
Facets:
value: very
type: DEGREE
value: historically
type: TEMPORAL
value: relatively
type: DEGREE
Source sentences:
text: Underground coal mining is especially dangerous because coal can give off poisonous and explosive gases.
text: Historically, coal mining has been a very dangerous activity and the list of historical coal mining disasters is a long one.
text: Coal mining is a relatively dangerous industry.