Assertion: obsidian | /r/CapableOf | occur as explosive eruption
Facets:
Source sentences:
text: Obsidian occurs as a flow, not as an explosive eruption in contrast to a vesiculated rhoylite pumice or dacite .
text: Obsidian occurs as a flow, not as an explosive eruption in contrast to a vesiculated rhoylite pumice or dacite .