Assertion: comet's ice | /r/HasProperty | uncovered by minor impacts
Facets:
Source sentences:
text: The activity persists for a month or several out of each 5-6 year orbit, and is presumably due to ice being uncovered by minor impacts in the last 100 to 1000 years.
text: The activity persists for a month or several out of each 5-6 year orbit, and is presumably due to ice being uncovered by minor impacts in the last 100 to 1000 years.