Assertion: cumulonimbus cloud | /r/Desires | an unstable air
Facets:
value: in order to form
type: PURPOSE
Source sentences:
text: In general, cumulonimbus require moisture, an unstable air mass, and a lifting force (heat) in order to form.
text: In general, cumulonimbus require moisture, an unstable air mass, and a lifting force (heat) in order to form.