Assertion: obsidian | /r/CapableOf | change in process
Facets:
value: from glass
type: LOCATION
value: gradually
type: MANNER
value: over a long period of time
type: TEMPORAL
Source sentences:
text: Over a long period of time, obsidian gradually changes from glass to rock in a process known as "devitrification.
text: Over a long period of time, obsidian gradually changes from glass to rock in a process known as "devitrification.