Assertion: comet's ice | /r/HasProperty | volatile
Facets:
Source sentences:
text: An extinct comet is a comet that has expelled most of its volatile ice and has little left to form a tail and coma.
text: The "ice" may be water, methane, ammonia, or other volatiles, alone or in combination.
text: Extinct comets are those that have expelled most of their volatile ice and have little left to form a tail or coma.