Assertion: comet | /r/HasProperty | a mixture of rock and ice
Facets:
Source sentences:
text: In simple terms, asteroids are rocky and devoid of ices, while comets are a mixture of rock and ice, so-called ‘dirty snowballs,’” Knight added.
text: Asteroids are rocky, with no ice, and comets are a mixture of rock and ice, so the scientists decided to use the more general word, “object.