Assertion: main ring | /r/HasProperty | 99.9% pure water ice
Facets:
value: with a smattering of impurities
type: OTHER
Source sentences:
text: With an estimated local thickness of as little as 10 m and as much as 1 km, they are composed of 99.9% pure water ice with a smattering of impurities that may include tholins or silicates.